Equal elemental amount · snapshot 2026-08-10

Magnesium glycinate vs Magnesium citrate

For 200 mg elemental magnesium, magnesium glycinate requires 1,418–1,691 mg of compound and magnesium citrate requires 1,238–1,770 mg, using the chemistry accompanying the 2026-08-10 label snapshot. This difference follows from the magnesium fraction of each compound. It requires no absorption-study assumption: the same elemental mass travels with a different mass of the rest of the compound.

Show the working

Same elemental amount, different compound mass

At 100, 200 and 400 mg elemental magnesium, the chemistry accompanying the 2026-08-10 snapshot uses 11.83–14.10% magnesium by mass for magnesium glycinate and 11.30–16.16% for magnesium citrate; dividing the elemental amount by these fractions gives the compound masses below.

Formula, magnesium fraction and compound mass · snapshot context 2026-08-10
Property	Magnesium glycinate	Magnesium citrate
Elemental Mg by compound mass	11.83–14.10%	11.30–16.16%
Anhydrous reference formula	Mg(C₂H₄NO₂)₂	Mg₃(C₆H₅O₇)₂
Molar mass of that reference formula	172.42 g/mol	451.11 g/mol
Composition interval	bisglycinate; chelate hydration varies by supplier	trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%
Compound for 100 mg elemental Mg	709–845 mg	619–885 mg
Compound for 200 mg elemental Mg	1,418–1,691 mg	1,238–1,770 mg
Compound for 400 mg elemental Mg	2,837–3,381 mg	2,475–3,540 mg
Size 00 capsules for 100 mg elemental Mg	1–2 capsules at 730 mg compound fill each	1–2 capsules at 730 mg compound fill each
Size 00 capsules for 200 mg elemental Mg	2–3 capsules at 730 mg compound fill each	2–3 capsules at 730 mg compound fill each
Size 00 capsules for 400 mg elemental Mg	4–5 capsules at 730 mg compound fill each	4–5 capsules at 730 mg compound fill each

Molar masses refer to the displayed anhydrous formulas. Hydrated or composition-ambiguous readings use the full fraction interval from the chemistry layer. Compound masses are rounded to whole milligrams; capsule counts round the unrounded mass divided by 730 mg upward at each interval endpoint.

Magnesium glycinate: 200 mg worked example

For 200 mg elemental magnesium as magnesium glycinate, the chemistry accompanying the 2026-08-10 snapshot requires 1,418–1,691 mg of compound: 200 ÷ 0.1410 through 200 ÷ 0.1183, rounded to whole milligrams.

That requires 2–3 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The mass interval reflects bisglycinate; chelate hydration varies by supplier.

Magnesium citrate: 200 mg worked example

For 200 mg elemental magnesium as magnesium citrate, the chemistry accompanying the 2026-08-10 snapshot requires 1,238–1,770 mg of compound: 200 ÷ 0.1616 through 200 ÷ 0.1130, rounded to whole milligrams.

That requires 2–3 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The mass interval reflects trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%.

Compound mass reference in 25 mg elemental increments

40 arithmetic inputs from 25 to 1,000 mg elemental magnesium are converted below using the two salt fractions and the capsule capacities accompanying the 2026-08-10 snapshot, calculated 2026-09-13. These are mass-conversion inputs, independent of any consumption schedule.

Each compound interval divides the elemental input by the high and low magnesium fractions. Each capsule interval divides those unrounded compound masses by the listed fill capacity, then rounds upward. The three capsule sizes use 545, 730 and 1100 mg of compound per capsule respectively, before other ingredients.

Magnesium glycinate and Magnesium citrate · 40 elemental inputs · 2026-09-13
Elemental Mg	Magnesium glycinate: compound mass	Magnesium glycinate: size 0	Magnesium glycinate: size 00	Magnesium glycinate: size 000	Magnesium citrate: compound mass	Magnesium citrate: size 0	Magnesium citrate: size 00	Magnesium citrate: size 000
25 mg elemental Mg	177–211 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill	155–221 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
50 mg elemental Mg	355–423 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill	309–442 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
75 mg elemental Mg	532–634 mg compound	1–2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill	464–664 mg compound	1–2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
100 mg elemental Mg	709–845 mg compound	2 capsules at 545 mg fill	1–2 capsules at 730 mg fill	1 capsules at 1100 mg fill	619–885 mg compound	2 capsules at 545 mg fill	1–2 capsules at 730 mg fill	1 capsules at 1100 mg fill
125 mg elemental Mg	887–1,057 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill	774–1,106 mg compound	2–3 capsules at 545 mg fill	2 capsules at 730 mg fill	1–2 capsules at 1100 mg fill
150 mg elemental Mg	1,064–1,268 mg compound	2–3 capsules at 545 mg fill	2 capsules at 730 mg fill	1–2 capsules at 1100 mg fill	928–1,327 mg compound	2–3 capsules at 545 mg fill	2 capsules at 730 mg fill	1–2 capsules at 1100 mg fill
175 mg elemental Mg	1,241–1,479 mg compound	3 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 capsules at 1100 mg fill	1,083–1,549 mg compound	2–3 capsules at 545 mg fill	2–3 capsules at 730 mg fill	1–2 capsules at 1100 mg fill
200 mg elemental Mg	1,418–1,691 mg compound	3–4 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 capsules at 1100 mg fill	1,238–1,770 mg compound	3–4 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 capsules at 1100 mg fill
225 mg elemental Mg	1,596–1,902 mg compound	3–4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill	1,392–1,991 mg compound	3–4 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 capsules at 1100 mg fill
250 mg elemental Mg	1,773–2,113 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill	1,547–2,212 mg compound	3–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill
275 mg elemental Mg	1,950–2,325 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill	1,702–2,434 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill
300 mg elemental Mg	2,128–2,536 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill	1,856–2,655 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill
325 mg elemental Mg	2,305–2,747 mg compound	5–6 capsules at 545 mg fill	4 capsules at 730 mg fill	3 capsules at 1100 mg fill	2,011–2,876 mg compound	4–6 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill
350 mg elemental Mg	2,482–2,959 mg compound	5–6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 capsules at 1100 mg fill	2,166–3,097 mg compound	4–6 capsules at 545 mg fill	3–5 capsules at 730 mg fill	2–3 capsules at 1100 mg fill
375 mg elemental Mg	2,660–3,170 mg compound	5–6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 capsules at 1100 mg fill	2,321–3,319 mg compound	5–7 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3–4 capsules at 1100 mg fill
400 mg elemental Mg	2,837–3,381 mg compound	6–7 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3–4 capsules at 1100 mg fill	2,475–3,540 mg compound	5–7 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3–4 capsules at 1100 mg fill
425 mg elemental Mg	3,014–3,593 mg compound	6–7 capsules at 545 mg fill	5 capsules at 730 mg fill	3–4 capsules at 1100 mg fill	2,630–3,761 mg compound	5–7 capsules at 545 mg fill	4–6 capsules at 730 mg fill	3–4 capsules at 1100 mg fill
450 mg elemental Mg	3,191–3,804 mg compound	6–7 capsules at 545 mg fill	5–6 capsules at 730 mg fill	3–4 capsules at 1100 mg fill	2,785–3,982 mg compound	6–8 capsules at 545 mg fill	4–6 capsules at 730 mg fill	3–4 capsules at 1100 mg fill
475 mg elemental Mg	3,369–4,015 mg compound	7–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	4 capsules at 1100 mg fill	2,939–4,204 mg compound	6–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	3–4 capsules at 1100 mg fill
500 mg elemental Mg	3,546–4,227 mg compound	7–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	4 capsules at 1100 mg fill	3,094–4,425 mg compound	6–9 capsules at 545 mg fill	5–7 capsules at 730 mg fill	3–5 capsules at 1100 mg fill
525 mg elemental Mg	3,723–4,438 mg compound	7–9 capsules at 545 mg fill	6–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill	3,249–4,646 mg compound	6–9 capsules at 545 mg fill	5–7 capsules at 730 mg fill	3–5 capsules at 1100 mg fill
550 mg elemental Mg	3,901–4,649 mg compound	8–9 capsules at 545 mg fill	6–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill	3,403–4,867 mg compound	7–9 capsules at 545 mg fill	5–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill
575 mg elemental Mg	4,078–4,861 mg compound	8–9 capsules at 545 mg fill	6–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill	3,558–5,088 mg compound	7–10 capsules at 545 mg fill	5–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill
600 mg elemental Mg	4,255–5,072 mg compound	8–10 capsules at 545 mg fill	6–7 capsules at 730 mg fill	4–5 capsules at 1100 mg fill	3,713–5,310 mg compound	7–10 capsules at 545 mg fill	6–8 capsules at 730 mg fill	4–5 capsules at 1100 mg fill
625 mg elemental Mg	4,433–5,283 mg compound	9–10 capsules at 545 mg fill	7–8 capsules at 730 mg fill	5 capsules at 1100 mg fill	3,868–5,531 mg compound	8–11 capsules at 545 mg fill	6–8 capsules at 730 mg fill	4–6 capsules at 1100 mg fill
650 mg elemental Mg	4,610–5,495 mg compound	9–11 capsules at 545 mg fill	7–8 capsules at 730 mg fill	5 capsules at 1100 mg fill	4,022–5,752 mg compound	8–11 capsules at 545 mg fill	6–8 capsules at 730 mg fill	4–6 capsules at 1100 mg fill
675 mg elemental Mg	4,787–5,706 mg compound	9–11 capsules at 545 mg fill	7–8 capsules at 730 mg fill	5–6 capsules at 1100 mg fill	4,177–5,973 mg compound	8–11 capsules at 545 mg fill	6–9 capsules at 730 mg fill	4–6 capsules at 1100 mg fill
700 mg elemental Mg	4,965–5,917 mg compound	10–11 capsules at 545 mg fill	7–9 capsules at 730 mg fill	5–6 capsules at 1100 mg fill	4,332–6,195 mg compound	8–12 capsules at 545 mg fill	6–9 capsules at 730 mg fill	4–6 capsules at 1100 mg fill
725 mg elemental Mg	5,142–6,128 mg compound	10–12 capsules at 545 mg fill	8–9 capsules at 730 mg fill	5–6 capsules at 1100 mg fill	4,486–6,416 mg compound	9–12 capsules at 545 mg fill	7–9 capsules at 730 mg fill	5–6 capsules at 1100 mg fill
750 mg elemental Mg	5,319–6,340 mg compound	10–12 capsules at 545 mg fill	8–9 capsules at 730 mg fill	5–6 capsules at 1100 mg fill	4,641–6,637 mg compound	9–13 capsules at 545 mg fill	7–10 capsules at 730 mg fill	5–7 capsules at 1100 mg fill
775 mg elemental Mg	5,496–6,551 mg compound	11–13 capsules at 545 mg fill	8–9 capsules at 730 mg fill	5–6 capsules at 1100 mg fill	4,796–6,858 mg compound	9–13 capsules at 545 mg fill	7–10 capsules at 730 mg fill	5–7 capsules at 1100 mg fill
800 mg elemental Mg	5,674–6,762 mg compound	11–13 capsules at 545 mg fill	8–10 capsules at 730 mg fill	6–7 capsules at 1100 mg fill	4,950–7,080 mg compound	10–13 capsules at 545 mg fill	7–10 capsules at 730 mg fill	5–7 capsules at 1100 mg fill
825 mg elemental Mg	5,851–6,974 mg compound	11–13 capsules at 545 mg fill	9–10 capsules at 730 mg fill	6–7 capsules at 1100 mg fill	5,105–7,301 mg compound	10–14 capsules at 545 mg fill	7–11 capsules at 730 mg fill	5–7 capsules at 1100 mg fill
850 mg elemental Mg	6,028–7,185 mg compound	12–14 capsules at 545 mg fill	9–10 capsules at 730 mg fill	6–7 capsules at 1100 mg fill	5,260–7,522 mg compound	10–14 capsules at 545 mg fill	8–11 capsules at 730 mg fill	5–7 capsules at 1100 mg fill
875 mg elemental Mg	6,206–7,396 mg compound	12–14 capsules at 545 mg fill	9–11 capsules at 730 mg fill	6–7 capsules at 1100 mg fill	5,415–7,743 mg compound	10–15 capsules at 545 mg fill	8–11 capsules at 730 mg fill	5–8 capsules at 1100 mg fill
900 mg elemental Mg	6,383–7,608 mg compound	12–14 capsules at 545 mg fill	9–11 capsules at 730 mg fill	6–7 capsules at 1100 mg fill	5,569–7,965 mg compound	11–15 capsules at 545 mg fill	8–11 capsules at 730 mg fill	6–8 capsules at 1100 mg fill
925 mg elemental Mg	6,560–7,819 mg compound	13–15 capsules at 545 mg fill	9–11 capsules at 730 mg fill	6–8 capsules at 1100 mg fill	5,724–8,186 mg compound	11–16 capsules at 545 mg fill	8–12 capsules at 730 mg fill	6–8 capsules at 1100 mg fill
950 mg elemental Mg	6,738–8,030 mg compound	13–15 capsules at 545 mg fill	10–12 capsules at 730 mg fill	7–8 capsules at 1100 mg fill	5,879–8,407 mg compound	11–16 capsules at 545 mg fill	9–12 capsules at 730 mg fill	6–8 capsules at 1100 mg fill
975 mg elemental Mg	6,915–8,242 mg compound	13–16 capsules at 545 mg fill	10–12 capsules at 730 mg fill	7–8 capsules at 1100 mg fill	6,033–8,628 mg compound	12–16 capsules at 545 mg fill	9–12 capsules at 730 mg fill	6–8 capsules at 1100 mg fill
1000 mg elemental Mg	7,092–8,453 mg compound	14–16 capsules at 545 mg fill	10–12 capsules at 730 mg fill	7–8 capsules at 1100 mg fill	6,188–8,850 mg compound	12–17 capsules at 545 mg fill	9–13 capsules at 730 mg fill	6–9 capsules at 1100 mg fill

A whole capsule count describes the minimum number of modelled containers needed to hold compound mass. It does not establish the dimensions, packing density or excipient content of a retail product. The ingredient list and serving statement on each linked record supply the product-specific context.

Declarations against capacity

How each salt's capsule labels distribute

In the 2026-08-10 snapshot, the magnesium glycinate form group has 42 audited capsule labels and the magnesium citrate group has 83; their distributions below use the mass-budget counts stored for each form, at powder density 0.6–0.8 g/mL.

Capsule mass budgets within each form group · 2026-08-10
Salt group	All labels	Audited capsules	Fits 0/00	Needs 000	Exceeds 000
Magnesium glycinate	126	42	16	13	13
Magnesium citrate	212	83	26	44	13

At 2026-08-10, magnesium glycinate has 16 of 42 audited capsule labels at or below 730 mg minimum compound mass per capsule, 13 above 730 mg but at or below 1100 mg, and 13 above 1100 mg. Its other 84 labels have no capsule verdict in this group, either because they are not classified as capsules or because a mass budget is unavailable.

At 2026-08-10, magnesium citrate has 26 of 83 audited capsule labels at or below 730 mg minimum compound mass per capsule, 44 above 730 mg but at or below 1100 mg, and 13 above 1100 mg. Its other 129 labels have no capsule verdict in this group, either because they are not classified as capsules or because a mass budget is unavailable.

The audit divides a label's elemental amount by its assigned salt fraction and serving-unit count. It uses the highest fraction, hence the smallest required mass. A hydration interval can move a nominally fitting label into a larger size at its high-mass end. A result exceeding 000 means the assigned single salt exceeds this fill model even at the low-mass end.

Form groups include names in extracted primary rows, resolved salts and full-record salt mentions, and can overlap; a capsule verdict requires a single assigned salt matching this group. These are counts of label declarations, with the capsule model allocating the fill to the compound. Inspect individual serving statements and assigned salts in the audit register and the linked form pages.

Literature coverage

Which measurements are attached to these salts?

As of the literature review dated 2026-09-11, the supplied study collection associates 6 publications with magnesium glycinate and 10 with magnesium citrate; the combined list contains 12 unique publications, with shared records printed once.

Study-set membership · reviewed 2026-09-11
Salt	Publications	Publication years
Magnesium glycinate	6	1995–2024
Magnesium citrate	10	1990–2025

Membership means that at least one selected salt appears in the study's recorded coverage; it does not mean every paper directly compares this exact pair. In particular, an amino-acid-chelate arm does not establish a chemically defined bisglycinate preparation. Each record below retains its actual design, population, read-out and limits.

Published measurements · peer-reviewed sources

12 published measurements relevant to this pair

The 2026-09-11 literature review links these 12 publications, ordered newest first; study outcomes remain attached to their own experimental conditions.

These entries report what each study measured and on whom. They are not advice, not a ranking, and not a claim about any product on this site. Every reference links to its PubMed record so the original can be read in full.

Comparing the Bioavailability of Two Seawater-Derived Magnesium Preparations.
Journal of medicinal food · 2025 · PMID 40955524
Design
Double-blind, randomized, three-arm crossover study in 20 healthy young men and women: placebo (maltodextrin), seawater-derived magnesium citrate (Aquamin-Mg, minimum 10% elemental magnesium), and seawater-derived magnesium hydroxide (Aquamin-MgTg, minimum 33% elemental magnesium). Total magnesium doses were standardized to the RDA for elemental magnesium.
What it measured
Incremental 18-hour urinary magnesium excretion as the relative-bioavailability marker; serum magnesium concentration at 1 and 2 hours post-ingestion (colorimetric assay, run in triplicate).
Limits
Small sample (n=20); healthy young adults only, not a magnesium-deficient or older population; only two seawater-derived preparations plus placebo were tested, no head-to-head comparison against standard magnesium citrate/oxide/glycinate salts; short observation window (18 h urine, 2 h serum).
Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources.
Nutrients · 2024 · PMID 39770988
Design
Double-blind, randomized, cross-over clinical study in 40 healthy women and men. Participants followed a low-magnesium diet for 7 days and fasted 8 hours, then received a single oral dose of each of four products in cross-over fashion: microencapsulated magnesium (Mg-MS / MAGSHAPE), magnesium oxide (MgO), magnesium citrate (Mg-C), and magnesium bisglycinate (Mg-BG). Blood was drawn by digital puncture before dosing (0 h) and at 1, 4, and 6 hours after each product.
What it measured
Plasma magnesium concentration at 0, 1, 4, and 6 hours after oral intake of each of the four products; gastrointestinal side effects (intestinal motility, sensations of gastric heaviness) associated with each product.
Limits
Single-dose exposure per product, not chronic supplementation; sample size n=40; a specific proprietary microencapsulation technology was tested, which may not generalize to other encapsulation methods; plasma magnesium was the only absorption marker used (no urinary or tissue measurement).
The bioaccessibility and tolerability of marine-derived sources of magnesium and calcium.
Methods (San Diego, Calif.) · 2024 · PMID 38608850
Design
Two-part study. (1) In vitro digestion (INFOGEST method) comparing solubility of Aquamin-Mg (seawater-derived, 12% magnesium), a commercially available magnesium bisglycinate, and a specific branded magnesium bisglycinate (PrizMAG) during simulated gastric and intestinal digestion phases, with and without co-administered food. (2) A randomized, double-blind, placebo-controlled 12-week study in a small cohort of healthy older adults given a combined Aquamin-Mg/Aquamin-F supplement.
What it measured
In vitro mineral solubility during simulated gastric and intestinal digestion phases; adverse-event reporting and tolerability over the 12-week human study arm.
Limits
The solubility comparison was performed in vitro (simulated digestion model), not as in vivo human absorption; the human arm assessed tolerability/safety only, not comparative bioavailability; the human cohort was described only as small and limited to older adults, with no numeric sample size given in the abstract.
Effects of short-term magnesium supplementation on ionized, total magnesium and other relevant electrolytes levels.
Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022 · PMID 35041150
Design
Short-term, 10-day supplementation study in 61 healthy young female adults, comparing three magnesium supplement forms: magnesium oxide (powder/granulate), magnesium citrate, and magnesium carbonate (effervescent tablets).
What it measured
Ionized magnesium concentration and its percentage of total magnesium; serum total magnesium concentration; other serum electrolyte levels — each assessed at baseline and after the 10-day intervention.
Limits
Healthy young female adults only, no male or older/deficient populations studied; short 10-day intervention with no longer-term follow-up; three specific product formulations were tested, so results may not generalize to other products of the same salts; the abstract does not report the per-arm breakdown of the 61 participants.
Dose-Dependent Absorption Profile of Different Magnesium Compounds
Biological Trace Element Research · 2020 · PMID 30761462
Design
Absorption of several magnesium compounds profiled across doses rather than at a single dose.
What it measured
Absorption is treated as dose-dependent, so a comparison made at one dose need not hold at another — which is why single-dose head-to-head results disagree.
Limits
Compound coverage and sample size vary by arm; read the paper before carrying any single figure across.
Timeline (Bioavailability) of Magnesium Compounds in Hours: Which Magnesium Compound Works Best?
Biological trace element research · 2019 · PMID 29679349
Design
Single-dose administration of 400 mg/70 kg magnesium as one of five compounds (magnesium sulfate, magnesium oxide, magnesium acetyl taurate, magnesium citrate, magnesium malate) to Sprague Dawley rats, with a control group, followed by time-dependent tissue and serum sampling.
What it measured
Time-dependent magnesium absorption profile (area under the curve) in serum; magnesium tissue penetration and concentration, including brain tissue; behavioral indicators (e.g., anxiety-related behavior) recorded in the animals.
Limits
Animal model (Sprague Dawley rats), not humans — extrapolation of pharmacokinetic and behavioral findings to people is not established; single dose only, no chronic-dosing data; per-compound group sample size is not stated in the abstract; behavioral endpoints were measured only in rodents. The tested acetyl taurate is distinct from the unmodified taurate in the chemistry table.
Comparison of magnesium status using X-ray dispersion analysis following magnesium oxide and magnesium citrate treatment of healthy subjects
Magnesium Research · 2012 · PMID 22433473
Design
Oral magnesium citrate versus magnesium oxide in healthy subjects; intracellular magnesium measured by X-ray dispersion analysis, alongside platelet function.
What it measured
The comparison used intracellular magnesium rather than serum magnesium, which changes what the read-out means.
Limits
Healthy subjects, small sample; intracellular magnesium by X-ray dispersion is not a routine clinical measure.
Study of magnesium bioavailability from ten organic and inorganic Mg salts in Mg-depleted rats using a stable isotope approach
Magnesium Research · 2005 · PMID 16548135
Design
Eighty male Wistar rats fed a magnesium-depleted diet for three weeks, then randomised into ten groups, each receiving a different magnesium salt labelled with a stable isotope.
What it measured
Stable isotopes allow absorption and retention to be traced directly rather than inferred from urine, across ten salts at once — the widest head-to-head comparison in the literature.
Limits
Rats, not people, and magnesium-depleted rats at that: depletion itself raises absorption. The breadth of the comparison is its value; the species is its limit.
Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study
Magnesium Research · 2003 · PMID 14596323
Design
Randomised, double-blind, placebo-controlled parallel study in 46 healthy individuals, 300 mg of elemental magnesium per day, comparing an amino-acid chelate, citrate and oxide.
What it measured
Relative bioavailability of the three preparations was compared at an equal elemental dose.
Limits
46 participants, healthy, 300 mg per day; “amino-acid chelate” is a class rather than one defined compound, so the chelate arm is not a single substance.
Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection
JPEN: Journal of Parenteral and Enteral Nutrition · 1995 · PMID 7815675
Design
Comparison of magnesium diglycinate (a chelate) with magnesium oxide in patients who had undergone ileal resection.
What it measured
The work followed in vitro and in situ findings suggesting diglycinate is absorbed by a different route than inorganic salts, and tested that in patients with impaired absorption.
Limits
Patients after ileal resection are a specific clinical population with poor absorption to begin with; results do not transfer to people with an intact gut.
Magnesium bioavailability from magnesium citrate and magnesium oxide
Journal of the American College of Nutrition · 1990 · PMID 2407766
Design
In vitro solubility of 25 mmol of each salt across hydrochloric acid concentrations mimicking achlorhydric to peak acid secretion, plus in vivo gastrointestinal absorbability.
What it measured
Magnesium oxide was virtually insoluble across the acid range tested, while citrate dissolved; absorbability was then compared in vivo.
Limits
Solubility in a beaker is not absorption in a person; the in vivo arm is small. Published 1990.
Effect of magnesium citrate and magnesium oxide on the crystallization of calcium salts in urine
The Journal of Urology · 1990 · PMID 2299712
Design
Seven normal subjects and four patients with recurrent calcium oxalate stones; 486 mg of magnesium per day for two weeks, taken on an empty stomach and again with food.
What it measured
Taken on an empty stomach, urinary magnesium rose by only 77–79 mg per day out of 486 mg given — and the increase changed when the dose was taken with food.
Limits
Eleven subjects; the endpoint is urinary chemistry in stone formers, not absorption in general. Published 1990.

Magnesium glycinate: trace the filed inputs

8 of 126 labels mentioning magnesium glycinate are shown in brand order from the supplied NIH DSLD records, calculated 2026-09-13. Salt mentions can overlap; only records assigned this single salt enter its capsule audit above.

Filed labels in brand and product order · 8 labels · calculated 2026-09-13
Brand / label	Salt / physical state	Filed serving	Observed item price / EC100
Adaptogen Research Magnesium Buffered ChelateNIH DSLD 247097 · label 2021-05-22	Single salt unresolved as of 2026-09-13Capsule	2 Capsule(s)300 mg elemental magnesium per serving	No published price matched to barcode 688907 859794 as of 2026-09-13.
Adaptogen Research Magnesium Buffered ChelateNIH DSLD 247098 · label 2021-05-22	Single salt unresolved as of 2026-09-13Capsule	2 Capsule(s)300 mg elemental magnesium per serving	No published price matched to barcode 688907 859800 as of 2026-09-13.
Akasha Naturals Magnesium GlycinateNIH DSLD 313115 · label 2024-10-24	Magnesium glycinateTablet or Pill	1 Tablet(s)100 mg elemental magnesium per serving	No published price matched to NIH DSLD 313115; barcode not filed as of 2026-09-13.
Amazon Elements Chelated Magnesium 270 mgNIH DSLD 203803 · label 2019-06-24	Magnesium glycinateTablet or Pill	2 Tablet(s)270 mg elemental magnesium per serving	$21.59 per container; $0.0666 per 100 mgObserved 2026-08-31 · legacy-verified
AN Amazing Nutrition Amazing Formulas Magnesium GlycinateNIH DSLD 251824 · label 2021-08-23	Magnesium glycinatePowder	1000–2200 mg (1/4 teaspoon-slightly rounded 1/2 teaspoon)401 mg elemental magnesium per serving	No published price matched to barcode 8 10180 02849 3 as of 2026-09-13.
AOR Advanced Orthomolecular Research Advanced Advanced Magnesium ComplexNIH DSLD 214423 · label 2020-02-26	Single salt unresolved as of 2026-09-13Capsule	1 Capsule(s)Elemental amount unresolved as of 2026-09-13	No published price matched to barcode 6 24917 08333 0 as of 2026-09-13.
Approved Science Magnesium ComplexNIH DSLD 319784 · label 2024-11-22	Single salt unresolved as of 2026-09-13Capsule	1 Capsule(s)200 mg elemental magnesium per serving	No published price matched to barcode X0039PGF67 as of 2026-09-13.
aSquared Nutrition Magnesium Glycinate 400 mgNIH DSLD 295336 · label 2023-07-18	Magnesium glycinateTablet or Pill	2 Tablet(s)400 mg elemental magnesium per serving	$27.95 per container; $0.0776 per 100 mgObserved 2026-09-11 · legacy-provisional

Open the salt index and linked records to inspect ingredient lists, the source of the assigned salt and dated gaps in price matching.

Magnesium citrate: trace the filed inputs

8 of 212 labels mentioning magnesium citrate are shown in brand order from the supplied NIH DSLD records, calculated 2026-09-13. Salt mentions can overlap; only records assigned this single salt enter its capsule audit above.

Filed labels in brand and product order · 8 labels · calculated 2026-09-13
Brand / label	Salt / physical state	Filed serving	Observed item price / EC100
Adaptogen Research Magnesium CitrateNIH DSLD 247099 · label 2021-05-22	Magnesium citrateCapsule	1 Capsule(s)150 mg elemental magnesium per serving	No published price matched to barcode 8 28054 70508 1 as of 2026-09-13.
Allergy Research Group Magnesium CitrateNIH DSLD 233067 · label 2020-08-23	Magnesium citrateCapsule	1 Capsule(s)170 mg elemental magnesium per serving	No published price matched to barcode 7 13947 70240 0 as of 2026-09-13.
Allergy Research Group Magnesium CitrateNIH DSLD 233300 · label 2020-08-23	Magnesium citrateCapsule	1 Capsule(s)170 mg elemental magnesium per serving	No published price matched to barcode 7 13947 76660 0 as of 2026-09-13.
Allergy Research Group Magnesium Malate ForteNIH DSLD 233224 · label 2020-08-23	Single salt unresolved as of 2026-09-13Tablet or Pill	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 70740 5 as of 2026-09-13.
Allergy Research Group Magnesium Malate ForteNIH DSLD 304253 · label 2023-12-14	Single salt unresolved as of 2026-09-13Tablet or Pill	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 70740 5 as of 2026-09-13.
AN Amazing Nutrition Amazing Formulas Magnesium Citrate 200 mgNIH DSLD 251825 · label 2021-08-23	Magnesium citrateTablet or Pill	1 Tablet(s)200 mg elemental magnesium per serving	No published price matched to barcode 8 10180 02665 9 as of 2026-09-13.
AN Amazing Nutrition Amazing Formulas Magnesium Citrate 200 mgNIH DSLD 256078 · label 2021-10-22	Magnesium citrateTablet or Pill	1 Tablet(s)200 mg elemental magnesium per serving	No published price matched to barcode 8 10180 02496 9 as of 2026-09-13.
AN Amazing Nutrition Amazing Formulas Magnesium Citrate 250 mgNIH DSLD 251815 · label 2021-08-23	Magnesium citratePowder	1.7 Gram(s) (1/2 Level Teaspoon)250 mg elemental magnesium per serving	No published price matched to barcode 8 10180 02763 2 as of 2026-09-13.

Open the salt index and linked records to inspect ingredient lists, the source of the assigned salt and dated gaps in price matching.

Retail observations · after chemistry and evidence

Price observations within each salt

As of 2026-09-13, the published price set contains 11 verified magnesium glycinate matches and 9 verified magnesium citrate matches. Each table below contains one salt and its own sample size; verified medians describe only that salt's verified rows.

EC100 = container price ÷ (declared elemental mg per serving × servings per container ÷ 100). It normalizes the container's elemental amount. The observations use one-time item prices, without coupons or subscriptions and excluding shipping. The tables retain the two salts' page order; sorting operates inside an individual salt table.

Magnesium glycinate: its own retail sample

As of 2026-09-13, magnesium glycinate has 11 verified matches and 9 pending matches in the price set. Its verified EC100 median is $0.1088 per 100 mg elemental magnesium (n=11); pending matches are excluded from that median. Observation dates: 2026-08-10 to 2026-09-11.

Magnesium glycinate · verified observations · reviewed 2026-09-13 · n= 11

Magnesium glycinate · verified observations · reviewed 2026-09-13 · n=

KAL	Magnesium Glycinate 400NIH DSLD · Label 253226	400 mg	45	$17.39Per container · Price observed 2026-09-07, Amazon	$0.096618.00 total elemental g/container	Verified
KAL	Magnesium Glycinate 400NIH DSLD · Label 255079	400 mg	60	$16.99Per container · Price observed 2026-09-07, Amazon	$0.070824.00 total elemental g/container	Verified
KAL	Magnesium Glycinate 400NIH DSLD · Label 255081	400 mg	90	$17.39Per container · Price observed 2026-09-07, Amazon	$0.048336.00 total elemental g/container	Verified
KAL	Magnesium Glycinate 400 Natural Orange FlavorNIH DSLD · Label 255083	400 mg	30	$22.10Per container · Price observed 2026-09-07, Amazon	$0.184212.00 total elemental g/container	Verified
Pure Encapsulations	Magnesium (Glycinate)NIH DSLD · Label 205309	120 mg	180	$46.50Per container · Price observed 2026-09-07, Amazon	$0.215321.60 total elemental g/container	Verified
Pure Encapsulations	Magnesium (Glycinate)NIH DSLD · Label 219667	120 mg	90	$27.00Per container · Price observed 2026-09-07, Amazon	$0.250010.80 total elemental g/container	Verified
Solgar	Chelated MagnesiumNIH DSLD · Label 217578	400 mg	25	$26.99Per container · Price observed 2026-09-07, Amazon	$0.269910.00 total elemental g/container	Verified
Solgar	Chelated MagnesiumNIH DSLD · Label 219379	400 mg	25	$26.99Per container · Price observed 2026-09-07, Amazon	$0.269910.00 total elemental g/container	Verified
Solgar	Chelated MagnesiumNIH DSLD · Label 217587	400 mg	62	$26.99Per container · Price observed 2026-09-07, Amazon	$0.108824.80 total elemental g/container	Verified
Solgar	Chelated MagnesiumNIH DSLD · Label 239320	400 mg	62	$26.99Per container · Price observed 2026-09-07, Amazon	$0.108824.80 total elemental g/container	Verified
Amazon Elements	Chelated Magnesium 270 mgNIH DSLD · Label 203803	270 mg	120	$21.59Per container · Price observed 2026-08-31, Amazon	$0.066632.40 total elemental g/container	Verified

Magnesium glycinate · pending observations · reviewed 2026-09-13 · n= 9

These candidate retail-to-label matches remain separate from verified rows and are not included in verified medians.

Magnesium glycinate · pending observations · reviewed 2026-09-13 · n=

KAL	Magnesium Glycinate 400NIH DSLD · Label 255082	400 mg	30	$16.99Per container · Price observed 2026-08-10, Amazon	$0.141612.00 total elemental g/container	Pending verification
aSquared Nutrition	Magnesium Glycinate 400 mgNIH DSLD · Label 295336	400 mg	90	$27.95Per container · Price observed 2026-09-11, Amazon	$0.077636.00 total elemental g/container	Pending verification
BulkSupplements.com	Magnesium Glycinate PowderNIH DSLD · Label 329643	400 mg	454	$19.96Per container · Price observed 2026-09-11, Amazon	$0.0110181.60 total elemental g/container	Pending verification
Codeage	Liposomal Magnesium GlycinateNIH DSLD · Label 335374	350 mg	60	$39.99Per container · Price observed 2026-09-11, Amazon	$0.190421.00 total elemental g/container	Pending verification
Country Life	Magnesium Glycinate 400 mg Tangy Berry FlavorNIH DSLD · Label 183706	400 mg	32	$29.99Per container · Price observed 2026-09-11, Amazon	$0.234312.80 total elemental g/container	Pending verification
The Vitamin Shoppe	Magnesium Glycinate 400 mgNIH DSLD · Label 204459	400 mg	45	$19.99Per container · Price observed 2026-09-11, Amazon	$0.111118.00 total elemental g/container	Pending verification
tnvitamins	Magnesium Glycinate 300 mgNIH DSLD · Label 314544	300 mg	45	$12.99Per container · Price observed 2026-09-11, Amazon	$0.096213.50 total elemental g/container	Pending verification
Douglas Laboratories	Magnesium GlycinateNIH DSLD · Label 230442	100 mg	240	$51.00Per container · Price observed 2026-09-11, Amazon	$0.212524.00 total elemental g/container	Pending verification
Dr. Berg	Magnesium GlycinateNIH DSLD · Label 316067	400 mg	30	$29.99Per container · Price observed 2026-09-11, Amazon	$0.249912.00 total elemental g/container	Pending verification

Open the magnesium glycinate label group →

Magnesium citrate: its own retail sample

As of 2026-09-13, magnesium citrate has 9 verified matches and 10 pending matches in the price set. Its verified EC100 median is $0.1331 per 100 mg elemental magnesium (n=9); pending matches are excluded from that median. Observation dates: 2026-08-10 to 2026-09-11.

Magnesium citrate · verified observations · reviewed 2026-09-13 · n= 9

Magnesium citrate · verified observations · reviewed 2026-09-13 · n=

GNC	Magnesium 250 mg Strawberry Natural FlavorNIH DSLD · Label 243072	250 mg	30	$9.98Per container · Price observed 2026-09-07, Amazon	$0.13317.50 total elemental g/container	Verified
GNC	Magnesium Powder LemonNIH DSLD · Label 243047	325 mg	84	$22.99Per container · Price observed 2026-09-07, Amazon	$0.084227.30 total elemental g/container	Verified
Nature Made	Magnesium CitrateNIH DSLD · Label 179948	250 mg	30	$10.89Per container · Price observed 2026-09-07, Amazon	$0.14527.50 total elemental g/container	Verified
Nature Made	Magnesium CitrateNIH DSLD · Label 179947	250 mg	60	$10.89Per container · Price observed 2026-09-07, Amazon	$0.072615.00 total elemental g/container	Verified
Nature's Sunshine	Magnesium ComplexNIH DSLD · Label 255360	184 mg	50	$19.95Per container · Price observed 2026-09-07, Amazon	$0.21689.20 total elemental g/container	Verified
Natures Plus	KalmAssure Magnesium Powder 400 mg UnflavoredNIH DSLD · Label 187441	400 mg	60	$13.95Per container · Price observed 2026-09-07, Amazon	$0.058124.00 total elemental g/container	Verified
Pure Encapsulations	Magnesium (Citrate)NIH DSLD · Label 201495	150 mg	90	$20.50Per container · Price observed 2026-09-07, Amazon	$0.151913.50 total elemental g/container	Verified
Pure Encapsulations	Magnesium (Citrate/Malate)NIH DSLD · Label 184671	120 mg	90	$20.50Per container · Price observed 2026-09-07, Amazon	$0.189810.80 total elemental g/container	Verified
Solgar	Magnesium CitrateNIH DSLD · Label 219453	420 mg	30	$15.29Per container · Price observed 2026-09-07, Amazon	$0.121312.60 total elemental g/container	Verified

Magnesium citrate · pending observations · reviewed 2026-09-13 · n= 10

These candidate retail-to-label matches remain separate from verified rows and are not included in verified medians.

Magnesium citrate · pending observations · reviewed 2026-09-13 · n=

KAL	Magnesium Citrate 160 mg PowderNIH DSLD · Label 55106	160 mg	139	$21.99Per container · Price observed 2026-08-10, Amazon	$0.098922.24 total elemental g/container	Pending verification
KAL	Malic Acid 1500 mg with MagnesiumNIH DSLD · Label 253228	500 mg	30	$21.95Per container · Price observed 2026-08-10, Amazon	$0.146315.00 total elemental g/container	Pending verification
Nature's Lab	Magnesium Soothe 350 mg Raspberry LemonNIH DSLD · Label 207246	350 mg	100	$17.99Per container · Price observed 2026-08-10, Amazon	$0.051435.00 total elemental g/container	Pending verification
Best Naturals	Magnesium Citrate 200 mgNIH DSLD · Label 269854	400 mg	125	$17.21Per container · Price observed 2026-09-11, Amazon	$0.034450.00 total elemental g/container	Pending verification
Douglas Laboratories	Magnesium CitrateNIH DSLD · Label 232777	150 mg	90	$19.00Per container · Price observed 2026-09-11, Amazon	$0.140713.50 total elemental g/container	Pending verification
LES Labs	Magnesium CitrateNIH DSLD · Label 320259	225 mg	120	$20.99Per container · Price observed 2026-09-11, Amazon	$0.077727.00 total elemental g/container	Pending verification
NutriCology	Magnesium CitrateNIH DSLD · Label 235550	170 mg	180	$31.79Per container · Price observed 2026-09-11, Amazon	$0.103930.60 total elemental g/container	Pending verification
Pure Encapsulations	Magnesium (Citrate)NIH DSLD · Label 294013	150 mg	180	$36.50Per container · Price observed 2026-09-11, Amazon	$0.135227.00 total elemental g/container	Pending verification
Solgar	Magnesium CitrateNIH DSLD · Label 219466	420 mg	60	$15.29Per container · Price observed 2026-09-11, Amazon	$0.060725.20 total elemental g/container	Pending verification
Solgar	Magnesium CitrateNIH DSLD · Label 241135	420 mg	60	$15.29Per container · Price observed 2026-09-11, Amazon	$0.060725.20 total elemental g/container	Pending verification

Open the magnesium citrate label group →

To reproduce a container calculation, use the elemental cost calculator and its static mass tables. The magnesium collection abstract connects each salt group to the label corpus; the literature collection puts the cited measurements in their broader study context.