ElementalDose

Equal elemental amount · snapshot 2026-08-10

Magnesium chloride vs Magnesium citrate

For 200 mg elemental magnesium, magnesium chloride requires 783–1,672 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 11.96–25.53% magnesium by mass for magnesium chloride 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
PropertyMagnesium chlorideMagnesium citrate
Elemental Mg by compound mass11.96–25.53%11.30–16.16%
Anhydrous reference formulaMgCl₂Mg₃(C₆H₅O₇)₂
Molar mass of that reference formula95.21 g/mol451.11 g/mol
Composition intervalanhydrous 25.5%, hexahydrate 12.0%trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%
Compound for 100 mg elemental Mg392–836 mg619–885 mg
Compound for 200 mg elemental Mg783–1,672 mg1,238–1,770 mg
Compound for 400 mg elemental Mg1,567–3,344 mg2,475–3,540 mg
Size 00 capsules for 100 mg elemental Mg1–2 capsules at 730 mg compound fill each1–2 capsules at 730 mg compound fill each
Size 00 capsules for 200 mg elemental Mg2–3 capsules at 730 mg compound fill each2–3 capsules at 730 mg compound fill each
Size 00 capsules for 400 mg elemental Mg3–5 capsules at 730 mg compound fill each4–5 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 chloride: 200 mg worked example

For 200 mg elemental magnesium as magnesium chloride, the chemistry accompanying the 2026-08-10 snapshot requires 783–1,672 mg of compound: 200 ÷ 0.2553 through 200 ÷ 0.1196, 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 anhydrous 25.5%, hexahydrate 12.0%.

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 chloride and Magnesium citrate · 40 elemental inputs · 2026-09-13
Elemental MgMagnesium chloride: compound massMagnesium chloride: size 0Magnesium chloride: size 00Magnesium chloride: size 000Magnesium citrate: compound massMagnesium citrate: size 0Magnesium citrate: size 00Magnesium citrate: size 000
25 mg elemental Mg98–209 mg compound1 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill155–221 mg compound1 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill
50 mg elemental Mg196–418 mg compound1 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill309–442 mg compound1 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill
75 mg elemental Mg294–627 mg compound1–2 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill464–664 mg compound1–2 capsules at 545 mg fill1 capsules at 730 mg fill1 capsules at 1100 mg fill
100 mg elemental Mg392–836 mg compound1–2 capsules at 545 mg fill1–2 capsules at 730 mg fill1 capsules at 1100 mg fill619–885 mg compound2 capsules at 545 mg fill1–2 capsules at 730 mg fill1 capsules at 1100 mg fill
125 mg elemental Mg490–1,045 mg compound1–2 capsules at 545 mg fill1–2 capsules at 730 mg fill1 capsules at 1100 mg fill774–1,106 mg compound2–3 capsules at 545 mg fill2 capsules at 730 mg fill1–2 capsules at 1100 mg fill
150 mg elemental Mg588–1,254 mg compound2–3 capsules at 545 mg fill1–2 capsules at 730 mg fill1–2 capsules at 1100 mg fill928–1,327 mg compound2–3 capsules at 545 mg fill2 capsules at 730 mg fill1–2 capsules at 1100 mg fill
175 mg elemental Mg685–1,463 mg compound2–3 capsules at 545 mg fill1–3 capsules at 730 mg fill1–2 capsules at 1100 mg fill1,083–1,549 mg compound2–3 capsules at 545 mg fill2–3 capsules at 730 mg fill1–2 capsules at 1100 mg fill
200 mg elemental Mg783–1,672 mg compound2–4 capsules at 545 mg fill2–3 capsules at 730 mg fill1–2 capsules at 1100 mg fill1,238–1,770 mg compound3–4 capsules at 545 mg fill2–3 capsules at 730 mg fill2 capsules at 1100 mg fill
225 mg elemental Mg881–1,881 mg compound2–4 capsules at 545 mg fill2–3 capsules at 730 mg fill1–2 capsules at 1100 mg fill1,392–1,991 mg compound3–4 capsules at 545 mg fill2–3 capsules at 730 mg fill2 capsules at 1100 mg fill
250 mg elemental Mg979–2,090 mg compound2–4 capsules at 545 mg fill2–3 capsules at 730 mg fill1–2 capsules at 1100 mg fill1,547–2,212 mg compound3–5 capsules at 545 mg fill3–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill
275 mg elemental Mg1,077–2,299 mg compound2–5 capsules at 545 mg fill2–4 capsules at 730 mg fill1–3 capsules at 1100 mg fill1,702–2,434 mg compound4–5 capsules at 545 mg fill3–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill
300 mg elemental Mg1,175–2,508 mg compound3–5 capsules at 545 mg fill2–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill1,856–2,655 mg compound4–5 capsules at 545 mg fill3–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill
325 mg elemental Mg1,273–2,717 mg compound3–5 capsules at 545 mg fill2–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill2,011–2,876 mg compound4–6 capsules at 545 mg fill3–4 capsules at 730 mg fill2–3 capsules at 1100 mg fill
350 mg elemental Mg1,371–2,926 mg compound3–6 capsules at 545 mg fill2–5 capsules at 730 mg fill2–3 capsules at 1100 mg fill2,166–3,097 mg compound4–6 capsules at 545 mg fill3–5 capsules at 730 mg fill2–3 capsules at 1100 mg fill
375 mg elemental Mg1,469–3,135 mg compound3–6 capsules at 545 mg fill3–5 capsules at 730 mg fill2–3 capsules at 1100 mg fill2,321–3,319 mg compound5–7 capsules at 545 mg fill4–5 capsules at 730 mg fill3–4 capsules at 1100 mg fill
400 mg elemental Mg1,567–3,344 mg compound3–7 capsules at 545 mg fill3–5 capsules at 730 mg fill2–4 capsules at 1100 mg fill2,475–3,540 mg compound5–7 capsules at 545 mg fill4–5 capsules at 730 mg fill3–4 capsules at 1100 mg fill
425 mg elemental Mg1,665–3,554 mg compound4–7 capsules at 545 mg fill3–5 capsules at 730 mg fill2–4 capsules at 1100 mg fill2,630–3,761 mg compound5–7 capsules at 545 mg fill4–6 capsules at 730 mg fill3–4 capsules at 1100 mg fill
450 mg elemental Mg1,763–3,763 mg compound4–7 capsules at 545 mg fill3–6 capsules at 730 mg fill2–4 capsules at 1100 mg fill2,785–3,982 mg compound6–8 capsules at 545 mg fill4–6 capsules at 730 mg fill3–4 capsules at 1100 mg fill
475 mg elemental Mg1,861–3,972 mg compound4–8 capsules at 545 mg fill3–6 capsules at 730 mg fill2–4 capsules at 1100 mg fill2,939–4,204 mg compound6–8 capsules at 545 mg fill5–6 capsules at 730 mg fill3–4 capsules at 1100 mg fill
500 mg elemental Mg1,958–4,181 mg compound4–8 capsules at 545 mg fill3–6 capsules at 730 mg fill2–4 capsules at 1100 mg fill3,094–4,425 mg compound6–9 capsules at 545 mg fill5–7 capsules at 730 mg fill3–5 capsules at 1100 mg fill
525 mg elemental Mg2,056–4,390 mg compound4–9 capsules at 545 mg fill3–7 capsules at 730 mg fill2–4 capsules at 1100 mg fill3,249–4,646 mg compound6–9 capsules at 545 mg fill5–7 capsules at 730 mg fill3–5 capsules at 1100 mg fill
550 mg elemental Mg2,154–4,599 mg compound4–9 capsules at 545 mg fill3–7 capsules at 730 mg fill2–5 capsules at 1100 mg fill3,403–4,867 mg compound7–9 capsules at 545 mg fill5–7 capsules at 730 mg fill4–5 capsules at 1100 mg fill
575 mg elemental Mg2,252–4,808 mg compound5–9 capsules at 545 mg fill4–7 capsules at 730 mg fill3–5 capsules at 1100 mg fill3,558–5,088 mg compound7–10 capsules at 545 mg fill5–7 capsules at 730 mg fill4–5 capsules at 1100 mg fill
600 mg elemental Mg2,350–5,017 mg compound5–10 capsules at 545 mg fill4–7 capsules at 730 mg fill3–5 capsules at 1100 mg fill3,713–5,310 mg compound7–10 capsules at 545 mg fill6–8 capsules at 730 mg fill4–5 capsules at 1100 mg fill
625 mg elemental Mg2,448–5,226 mg compound5–10 capsules at 545 mg fill4–8 capsules at 730 mg fill3–5 capsules at 1100 mg fill3,868–5,531 mg compound8–11 capsules at 545 mg fill6–8 capsules at 730 mg fill4–6 capsules at 1100 mg fill
650 mg elemental Mg2,546–5,435 mg compound5–10 capsules at 545 mg fill4–8 capsules at 730 mg fill3–5 capsules at 1100 mg fill4,022–5,752 mg compound8–11 capsules at 545 mg fill6–8 capsules at 730 mg fill4–6 capsules at 1100 mg fill
675 mg elemental Mg2,644–5,644 mg compound5–11 capsules at 545 mg fill4–8 capsules at 730 mg fill3–6 capsules at 1100 mg fill4,177–5,973 mg compound8–11 capsules at 545 mg fill6–9 capsules at 730 mg fill4–6 capsules at 1100 mg fill
700 mg elemental Mg2,742–5,853 mg compound6–11 capsules at 545 mg fill4–9 capsules at 730 mg fill3–6 capsules at 1100 mg fill4,332–6,195 mg compound8–12 capsules at 545 mg fill6–9 capsules at 730 mg fill4–6 capsules at 1100 mg fill
725 mg elemental Mg2,840–6,062 mg compound6–12 capsules at 545 mg fill4–9 capsules at 730 mg fill3–6 capsules at 1100 mg fill4,486–6,416 mg compound9–12 capsules at 545 mg fill7–9 capsules at 730 mg fill5–6 capsules at 1100 mg fill
750 mg elemental Mg2,938–6,271 mg compound6–12 capsules at 545 mg fill5–9 capsules at 730 mg fill3–6 capsules at 1100 mg fill4,641–6,637 mg compound9–13 capsules at 545 mg fill7–10 capsules at 730 mg fill5–7 capsules at 1100 mg fill
775 mg elemental Mg3,036–6,480 mg compound6–12 capsules at 545 mg fill5–9 capsules at 730 mg fill3–6 capsules at 1100 mg fill4,796–6,858 mg compound9–13 capsules at 545 mg fill7–10 capsules at 730 mg fill5–7 capsules at 1100 mg fill
800 mg elemental Mg3,134–6,689 mg compound6–13 capsules at 545 mg fill5–10 capsules at 730 mg fill3–7 capsules at 1100 mg fill4,950–7,080 mg compound10–13 capsules at 545 mg fill7–10 capsules at 730 mg fill5–7 capsules at 1100 mg fill
825 mg elemental Mg3,231–6,898 mg compound6–13 capsules at 545 mg fill5–10 capsules at 730 mg fill3–7 capsules at 1100 mg fill5,105–7,301 mg compound10–14 capsules at 545 mg fill7–11 capsules at 730 mg fill5–7 capsules at 1100 mg fill
850 mg elemental Mg3,329–7,107 mg compound7–14 capsules at 545 mg fill5–10 capsules at 730 mg fill4–7 capsules at 1100 mg fill5,260–7,522 mg compound10–14 capsules at 545 mg fill8–11 capsules at 730 mg fill5–7 capsules at 1100 mg fill
875 mg elemental Mg3,427–7,316 mg compound7–14 capsules at 545 mg fill5–11 capsules at 730 mg fill4–7 capsules at 1100 mg fill5,415–7,743 mg compound10–15 capsules at 545 mg fill8–11 capsules at 730 mg fill5–8 capsules at 1100 mg fill
900 mg elemental Mg3,525–7,525 mg compound7–14 capsules at 545 mg fill5–11 capsules at 730 mg fill4–7 capsules at 1100 mg fill5,569–7,965 mg compound11–15 capsules at 545 mg fill8–11 capsules at 730 mg fill6–8 capsules at 1100 mg fill
925 mg elemental Mg3,623–7,734 mg compound7–15 capsules at 545 mg fill5–11 capsules at 730 mg fill4–8 capsules at 1100 mg fill5,724–8,186 mg compound11–16 capsules at 545 mg fill8–12 capsules at 730 mg fill6–8 capsules at 1100 mg fill
950 mg elemental Mg3,721–7,943 mg compound7–15 capsules at 545 mg fill6–11 capsules at 730 mg fill4–8 capsules at 1100 mg fill5,879–8,407 mg compound11–16 capsules at 545 mg fill9–12 capsules at 730 mg fill6–8 capsules at 1100 mg fill
975 mg elemental Mg3,819–8,152 mg compound8–15 capsules at 545 mg fill6–12 capsules at 730 mg fill4–8 capsules at 1100 mg fill6,033–8,628 mg compound12–16 capsules at 545 mg fill9–12 capsules at 730 mg fill6–8 capsules at 1100 mg fill
1000 mg elemental Mg3,917–8,361 mg compound8–16 capsules at 545 mg fill6–12 capsules at 730 mg fill4–8 capsules at 1100 mg fill6,188–8,850 mg compound12–17 capsules at 545 mg fill9–13 capsules at 730 mg fill6–9 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 chloride form group has 0 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 groupAll labelsAudited capsulesFits 0/00Needs 000Exceeds 000
Magnesium chloride190000
Magnesium citrate21283264413

At 2026-08-10, magnesium chloride has 0 of 0 audited capsule labels at or below 730 mg minimum compound mass per capsule, 0 above 730 mg but at or below 1100 mg, and 0 above 1100 mg. Its other 19 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 3 publications with magnesium chloride and 10 with magnesium citrate; the combined list contains 12 unique publications, with shared records printed once.

Study-set membership · reviewed 2026-09-11
SaltPublicationsPublication years
Magnesium chloride31992–2005
Magnesium citrate101990–2025

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.

  1. 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).

  2. 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).

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. Bioavailability of US commercial magnesium preparations

    Magnesium Research · 2001 · PMID 11794633

    Design
    Four commercially available US preparations given to healthy volunteers; bioavailability measured as the increment in urinary magnesium excretion.
    What it measured
    The study set out to test the claim that organic magnesium salts are more easily absorbed than inorganic ones, using urinary excretion as the read-out.
    Limits
    Healthy volunteers, small sample, urinary excretion as a proxy for absorption rather than a direct measurement of retention.

  10. Blood and urinary magnesium kinetics after oral magnesium supplements.

    Clinical therapeutics · 1992 · PMID 1468087

    Design
    Randomized, crossover study in 12 healthy normomagnesemic subjects: a baseline period followed by three separate one-week supplementation trials at 16 mmol/dose — magnesium chloride solution, slow-release magnesium chloride tablets, and magnesium gluconate tablets — with a standardized diet during each trial.
    What it measured
    Urinary magnesium excretion in 0-4, 4-8, 8-12, and 12-24 hour collections; intraleukocyte, total serum, and ultrafiltrable serum magnesium at 0, 1, 2, 3, 4, 8, 12, and 24 hours; area-under-curve for each compartment relative to baseline for each supplement form.
    Limits
    Very small sample (n=12); only two chemical forms tested (chloride in two formulations, plus gluconate); short trial duration per arm (24 hours, with weekly crossover intervals); normomagnesemic (not magnesium-deficient) subjects only.

  11. 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.

  12. 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 chloride: trace the filed inputs

8 of 19 labels mentioning magnesium chloride 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 / labelSalt / physical stateFiled servingObserved item price / EC100
Alta Health Products Magnesium ChlorideNIH DSLD 299274 · label 2023-11-22Magnesium chlorideTablet or Pill1–3 Tablet(s)Elemental amount unresolved as of 2026-09-13No published price matched to barcode 0 76920 00060 4 as of 2026-09-13.
Complete H2O Minerals Magnesium ConcentrateNIH DSLD 180155 · label 2018-08-31Magnesium chlorideLiquid0.33–1 Tbsp (5-15mL)18 mg elemental magnesium per servingNo published price matched to barcode 1 88671 00042 7 as of 2026-09-13.
Complete H2O Minerals Magnesium ConcentrateNIH DSLD 252064 · label 2021-07-27Magnesium chlorideLiquid15 mL (1 Tbsp.)18 mg elemental magnesium per servingNo published price matched to barcode 1 88671 00014 4 as of 2026-09-13.
Complete H2O Minerals Ultimate Magnesium ConcentrateNIH DSLD 252079 · label 2021-07-27Magnesium chlorideLiquid1 mL (25 drops)120 mg elemental magnesium per servingNo published price matched to barcode 8 52670 00617 8 as of 2026-09-13.
Douglas Laboratories Magnesium Aspartate 2XNIH DSLD 30655 · label 2014-02-26Single salt unresolved as of 2026-09-13Tablet or Pill1 Tablet(s)200 mg elemental magnesium per servingNo published price matched to barcode 3 10539 01313 7 as of 2026-09-13.
Douglas Laboratories Magnesium/Potassium ComplexNIH DSLD 26827 · label 2013-10-25Single salt unresolved as of 2026-09-13Capsule1 Capsule(s)90 mg elemental magnesium per servingNo published price matched to barcode 3 10539 71400 3 as of 2026-09-13.
Douglas Laboratories Magnesix Magnesium And B-6NIH DSLD 26807 · label 2013-10-25Magnesium oxideTablet or Pill1 Tablet(s)50 mg elemental magnesium per serving$11.50 per container; $0.2300 per 100 mgObserved 2026-09-07 · legacy-verified
Good State Ionic Magnesium 40,000 PPMNIH DSLD 229255 · label 2020-07-23Magnesium chlorideLiquid1.25–2.5 mL (1/4-1/2 cap)100 mg elemental magnesium per servingNo published price matched to barcode 8 57515 00312 1 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.

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 / labelSalt / physical stateFiled servingObserved item price / EC100
Adaptogen Research Magnesium CitrateNIH DSLD 247099 · label 2021-05-22Magnesium citrateCapsule1 Capsule(s)150 mg elemental magnesium per servingNo published price matched to barcode 8 28054 70508 1 as of 2026-09-13.
Allergy Research Group Magnesium CitrateNIH DSLD 233067 · label 2020-08-23Magnesium citrateCapsule1 Capsule(s)170 mg elemental magnesium per servingNo published price matched to barcode 7 13947 70240 0 as of 2026-09-13.
Allergy Research Group Magnesium CitrateNIH DSLD 233300 · label 2020-08-23Magnesium citrateCapsule1 Capsule(s)170 mg elemental magnesium per servingNo published price matched to barcode 7 13947 76660 0 as of 2026-09-13.
Allergy Research Group Magnesium Malate ForteNIH DSLD 233224 · label 2020-08-23Single salt unresolved as of 2026-09-13Tablet or Pill1–2 Tablet(s)124 mg elemental magnesium per servingNo published price matched to barcode 7 13947 70740 5 as of 2026-09-13.
Allergy Research Group Magnesium Malate ForteNIH DSLD 304253 · label 2023-12-14Single salt unresolved as of 2026-09-13Tablet or Pill1–2 Tablet(s)124 mg elemental magnesium per servingNo 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 2021-08-23Magnesium citrateTablet or Pill1 Tablet(s)200 mg elemental magnesium per servingNo 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 2021-10-22Magnesium citrateTablet or Pill1 Tablet(s)200 mg elemental magnesium per servingNo 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 2021-08-23Magnesium citratePowder1.7 Gram(s) (1/2 Level Teaspoon)250 mg elemental magnesium per servingNo 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 0 verified magnesium chloride 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 chloride: its own retail sample

As of 2026-09-13, magnesium chloride has 0 verified matches and 0 pending matches in the price set. No verified median is available as of 2026-09-13. Observation dates: No published observations as of 2026-09-13.

0 verified retail matches are published for magnesium chloride as of 2026-09-13.

There are 0 pending price matches for magnesium chloride as of 2026-09-13.

Open the magnesium chloride 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=
GNCMagnesium 250 mg Strawberry Natural FlavorNIH DSLD · Label 243072250 mg30$9.98Per container · Price observed 2026-09-07, Amazon$0.13317.50 total elemental g/containerVerified
GNCMagnesium Powder LemonNIH DSLD · Label 243047325 mg84$22.99Per container · Price observed 2026-09-07, Amazon$0.084227.30 total elemental g/containerVerified
Nature MadeMagnesium CitrateNIH DSLD · Label 179948250 mg30$10.89Per container · Price observed 2026-09-07, Amazon$0.14527.50 total elemental g/containerVerified
Nature MadeMagnesium CitrateNIH DSLD · Label 179947250 mg60$10.89Per container · Price observed 2026-09-07, Amazon$0.072615.00 total elemental g/containerVerified
Nature's SunshineMagnesium ComplexNIH DSLD · Label 255360184 mg50$19.95Per container · Price observed 2026-09-07, Amazon$0.21689.20 total elemental g/containerVerified
Natures PlusKalmAssure Magnesium Powder 400 mg UnflavoredNIH DSLD · Label 187441400 mg60$13.95Per container · Price observed 2026-09-07, Amazon$0.058124.00 total elemental g/containerVerified
Pure EncapsulationsMagnesium (Citrate)NIH DSLD · Label 201495150 mg90$20.50Per container · Price observed 2026-09-07, Amazon$0.151913.50 total elemental g/containerVerified
Pure EncapsulationsMagnesium (Citrate/Malate)NIH DSLD · Label 184671120 mg90$20.50Per container · Price observed 2026-09-07, Amazon$0.189810.80 total elemental g/containerVerified
SolgarMagnesium CitrateNIH DSLD · Label 219453420 mg30$15.29Per container · Price observed 2026-09-07, Amazon$0.121312.60 total elemental g/containerVerified
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=
KALMagnesium Citrate 160 mg PowderNIH DSLD · Label 55106160 mg139$21.99Per container · Price observed 2026-08-10, Amazon$0.098922.24 total elemental g/containerPending verification
KALMalic Acid 1500 mg with MagnesiumNIH DSLD · Label 253228500 mg30$21.95Per container · Price observed 2026-08-10, Amazon$0.146315.00 total elemental g/containerPending verification
Nature's LabMagnesium Soothe 350 mg Raspberry LemonNIH DSLD · Label 207246350 mg100$17.99Per container · Price observed 2026-08-10, Amazon$0.051435.00 total elemental g/containerPending verification
Best NaturalsMagnesium Citrate 200 mgNIH DSLD · Label 269854400 mg125$17.21Per container · Price observed 2026-09-11, Amazon$0.034450.00 total elemental g/containerPending verification
Douglas LaboratoriesMagnesium CitrateNIH DSLD · Label 232777150 mg90$19.00Per container · Price observed 2026-09-11, Amazon$0.140713.50 total elemental g/containerPending verification
LES LabsMagnesium CitrateNIH DSLD · Label 320259225 mg120$20.99Per container · Price observed 2026-09-11, Amazon$0.077727.00 total elemental g/containerPending verification
NutriCologyMagnesium CitrateNIH DSLD · Label 235550170 mg180$31.79Per container · Price observed 2026-09-11, Amazon$0.103930.60 total elemental g/containerPending verification
Pure EncapsulationsMagnesium (Citrate)NIH DSLD · Label 294013150 mg180$36.50Per container · Price observed 2026-09-11, Amazon$0.135227.00 total elemental g/containerPending verification
SolgarMagnesium CitrateNIH DSLD · Label 219466420 mg60$15.29Per container · Price observed 2026-09-11, Amazon$0.060725.20 total elemental g/containerPending verification
SolgarMagnesium CitrateNIH DSLD · Label 241135420 mg60$15.29Per container · Price observed 2026-09-11, Amazon$0.060725.20 total elemental g/containerPending 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.