Equal elemental amount · snapshot 2026-08-10

Magnesium aspartate vs Magnesium hydroxide

For 200 mg elemental magnesium, magnesium aspartate requires 1,279–2,670 mg of compound and magnesium hydroxide requires 480 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 7.49–15.64% magnesium by mass for magnesium aspartate and 41.68% for magnesium hydroxide; 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 aspartate	Magnesium hydroxide
Elemental Mg by compound mass	7.49–15.64%	41.68%
Anhydrous reference formula	MgC₄H₅NO₄	Mg(OH)₂
Molar mass of that reference formula	155.39 g/mol	58.32 g/mol
Composition interval	1:1 magnesium aspartate 15.64%; bis(hydrogen aspartate) 8.42%, its dihydrate 7.49%; stoichiometry and hydration unresolved	One formula fraction used for Mg(OH)₂ in this model.
Compound for 100 mg elemental Mg	639–1,335 mg	240 mg
Compound for 200 mg elemental Mg	1,279–2,670 mg	480 mg
Compound for 400 mg elemental Mg	2,558–5,340 mg	960 mg
Size 00 capsules for 100 mg elemental Mg	1–2 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 200 mg elemental Mg	2–4 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 400 mg elemental Mg	4–8 capsules at 730 mg compound fill each	2 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 aspartate: 200 mg worked example

For 200 mg elemental magnesium as magnesium aspartate, the chemistry accompanying the 2026-08-10 snapshot requires 1,279–2,670 mg of compound: 200 ÷ 0.1564 through 200 ÷ 0.0749, rounded to whole milligrams.

That requires 2–4 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The mass interval reflects 1:1 magnesium aspartate 15.64%; bis(hydrogen aspartate) 8.42%, its dihydrate 7.49%; stoichiometry and hydration unresolved.

Magnesium hydroxide: 200 mg worked example

For 200 mg elemental magnesium as magnesium hydroxide, the chemistry accompanying the 2026-08-10 snapshot requires 480 mg of compound: 200 ÷ 0.4168, rounded to whole milligrams.

That requires 1 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The model uses the Mg(OH)₂ fraction throughout.

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 2026-10-17. 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 aspartate and Magnesium hydroxide · 40 elemental inputs · 2026-10-17
Elemental Mg	Magnesium aspartate: compound mass	Magnesium aspartate: size 0	Magnesium aspartate: size 00	Magnesium aspartate: size 000	Magnesium hydroxide: compound mass	Magnesium hydroxide: size 0	Magnesium hydroxide: size 00	Magnesium hydroxide: size 000
25 mg elemental Mg	160–334 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill	60 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
50 mg elemental Mg	320–668 mg compound	1–2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill	120 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
75 mg elemental Mg	480–1,001 mg compound	1–2 capsules at 545 mg fill	1–2 capsules at 730 mg fill	1 capsules at 1100 mg fill	180 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
100 mg elemental Mg	639–1,335 mg compound	2–3 capsules at 545 mg fill	1–2 capsules at 730 mg fill	1–2 capsules at 1100 mg fill	240 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
125 mg elemental Mg	799–1,669 mg compound	2–4 capsules at 545 mg fill	2–3 capsules at 730 mg fill	1–2 capsules at 1100 mg fill	300 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
150 mg elemental Mg	959–2,003 mg compound	2–4 capsules at 545 mg fill	2–3 capsules at 730 mg fill	1–2 capsules at 1100 mg fill	360 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
175 mg elemental Mg	1,119–2,336 mg compound	3–5 capsules at 545 mg fill	2–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill	420 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
200 mg elemental Mg	1,279–2,670 mg compound	3–5 capsules at 545 mg fill	2–4 capsules at 730 mg fill	2–3 capsules at 1100 mg fill	480 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
225 mg elemental Mg	1,439–3,004 mg compound	3–6 capsules at 545 mg fill	2–5 capsules at 730 mg fill	2–3 capsules at 1100 mg fill	540 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
250 mg elemental Mg	1,598–3,338 mg compound	3–7 capsules at 545 mg fill	3–5 capsules at 730 mg fill	2–4 capsules at 1100 mg fill	600 mg compound	2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
275 mg elemental Mg	1,758–3,672 mg compound	4–7 capsules at 545 mg fill	3–6 capsules at 730 mg fill	2–4 capsules at 1100 mg fill	660 mg compound	2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
300 mg elemental Mg	1,918–4,005 mg compound	4–8 capsules at 545 mg fill	3–6 capsules at 730 mg fill	2–4 capsules at 1100 mg fill	720 mg compound	2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 capsules at 1100 mg fill
325 mg elemental Mg	2,078–4,339 mg compound	4–8 capsules at 545 mg fill	3–6 capsules at 730 mg fill	2–4 capsules at 1100 mg fill	780 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
350 mg elemental Mg	2,238–4,673 mg compound	5–9 capsules at 545 mg fill	4–7 capsules at 730 mg fill	3–5 capsules at 1100 mg fill	840 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
375 mg elemental Mg	2,398–5,007 mg compound	5–10 capsules at 545 mg fill	4–7 capsules at 730 mg fill	3–5 capsules at 1100 mg fill	900 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
400 mg elemental Mg	2,558–5,340 mg compound	5–10 capsules at 545 mg fill	4–8 capsules at 730 mg fill	3–5 capsules at 1100 mg fill	960 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
425 mg elemental Mg	2,717–5,674 mg compound	5–11 capsules at 545 mg fill	4–8 capsules at 730 mg fill	3–6 capsules at 1100 mg fill	1,020 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
450 mg elemental Mg	2,877–6,008 mg compound	6–12 capsules at 545 mg fill	4–9 capsules at 730 mg fill	3–6 capsules at 1100 mg fill	1,080 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 capsules at 1100 mg fill
475 mg elemental Mg	3,037–6,342 mg compound	6–12 capsules at 545 mg fill	5–9 capsules at 730 mg fill	3–6 capsules at 1100 mg fill	1,140 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
500 mg elemental Mg	3,197–6,676 mg compound	6–13 capsules at 545 mg fill	5–10 capsules at 730 mg fill	3–7 capsules at 1100 mg fill	1,200 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
525 mg elemental Mg	3,357–7,009 mg compound	7–13 capsules at 545 mg fill	5–10 capsules at 730 mg fill	4–7 capsules at 1100 mg fill	1,260 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
550 mg elemental Mg	3,517–7,343 mg compound	7–14 capsules at 545 mg fill	5–11 capsules at 730 mg fill	4–7 capsules at 1100 mg fill	1,320 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
575 mg elemental Mg	3,676–7,677 mg compound	7–15 capsules at 545 mg fill	6–11 capsules at 730 mg fill	4–7 capsules at 1100 mg fill	1,380 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
600 mg elemental Mg	3,836–8,011 mg compound	8–15 capsules at 545 mg fill	6–11 capsules at 730 mg fill	4–8 capsules at 1100 mg fill	1,440 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 capsules at 1100 mg fill
625 mg elemental Mg	3,996–8,344 mg compound	8–16 capsules at 545 mg fill	6–12 capsules at 730 mg fill	4–8 capsules at 1100 mg fill	1,500 mg compound	3 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
650 mg elemental Mg	4,156–8,678 mg compound	8–16 capsules at 545 mg fill	6–12 capsules at 730 mg fill	4–8 capsules at 1100 mg fill	1,560 mg compound	3 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
675 mg elemental Mg	4,316–9,012 mg compound	8–17 capsules at 545 mg fill	6–13 capsules at 730 mg fill	4–9 capsules at 1100 mg fill	1,619 mg compound	3 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
700 mg elemental Mg	4,476–9,346 mg compound	9–18 capsules at 545 mg fill	7–13 capsules at 730 mg fill	5–9 capsules at 1100 mg fill	1,679 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
725 mg elemental Mg	4,636–9,680 mg compound	9–18 capsules at 545 mg fill	7–14 capsules at 730 mg fill	5–9 capsules at 1100 mg fill	1,739 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
750 mg elemental Mg	4,795–10,013 mg compound	9–19 capsules at 545 mg fill	7–14 capsules at 730 mg fill	5–10 capsules at 1100 mg fill	1,799 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
775 mg elemental Mg	4,955–10,347 mg compound	10–19 capsules at 545 mg fill	7–15 capsules at 730 mg fill	5–10 capsules at 1100 mg fill	1,859 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
800 mg elemental Mg	5,115–10,681 mg compound	10–20 capsules at 545 mg fill	8–15 capsules at 730 mg fill	5–10 capsules at 1100 mg fill	1,919 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
825 mg elemental Mg	5,275–11,015 mg compound	10–21 capsules at 545 mg fill	8–16 capsules at 730 mg fill	5–11 capsules at 1100 mg fill	1,979 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
850 mg elemental Mg	5,435–11,348 mg compound	10–21 capsules at 545 mg fill	8–16 capsules at 730 mg fill	5–11 capsules at 1100 mg fill	2,039 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
875 mg elemental Mg	5,595–11,682 mg compound	11–22 capsules at 545 mg fill	8–17 capsules at 730 mg fill	6–11 capsules at 1100 mg fill	2,099 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
900 mg elemental Mg	5,754–12,016 mg compound	11–23 capsules at 545 mg fill	8–17 capsules at 730 mg fill	6–11 capsules at 1100 mg fill	2,159 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 capsules at 1100 mg fill
925 mg elemental Mg	5,914–12,350 mg compound	11–23 capsules at 545 mg fill	9–17 capsules at 730 mg fill	6–12 capsules at 1100 mg fill	2,219 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 capsules at 1100 mg fill
950 mg elemental Mg	6,074–12,684 mg compound	12–24 capsules at 545 mg fill	9–18 capsules at 730 mg fill	6–12 capsules at 1100 mg fill	2,279 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 capsules at 1100 mg fill
975 mg elemental Mg	6,234–13,017 mg compound	12–24 capsules at 545 mg fill	9–18 capsules at 730 mg fill	6–12 capsules at 1100 mg fill	2,339 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 capsules at 1100 mg fill
1000 mg elemental Mg	6,394–13,351 mg compound	12–25 capsules at 545 mg fill	9–19 capsules at 730 mg fill	6–13 capsules at 1100 mg fill	2,399 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 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 aspartate form group has 15 audited capsule labels and the magnesium hydroxide group has 0; their distributions below use the mass-budget counts stored for each form, at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range.

Capsule mass budgets within each form group · 2026-08-10
Salt group	All labels	Audited capsules	Fits 0/00	Needs 000	Exceeds 000
Magnesium aspartate	46	15	13	2	0
Magnesium hydroxide	10	0	0	0	0

At 2026-08-10, magnesium aspartate has 13 of 15 audited capsule labels at or below 730 mg minimum compound mass per capsule, 2 above 730 mg but at or below 1100 mg, and 0 above 1100 mg. Its other 31 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 hydroxide 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 10 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 2 publications with magnesium aspartate and 1 with magnesium hydroxide; the combined list contains 3 unique publications, with shared records printed once.

Study-set membership · reviewed 2026-09-11
Salt	Publications	Publication years
Magnesium aspartate	2	2001–2005
Magnesium hydroxide	1	2025–2025

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

3 published measurements relevant to this pair

The 2026-09-11 literature review links these 3 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).
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.
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.

Magnesium aspartate: trace the filed inputs

8 of 46 labels mentioning magnesium aspartate are shown in brand order from the supplied NIH DSLD records, calculated 2026-10-17. 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 2026-10-17
Brand / label	Salt / physical state	Filed serving	Observed item price / EC100
Adaptogen Research Potassium MagnesiumNIH DSLD 247239 · label 2021-05-22	Single salt unresolved as of 2026-10-17Tablet or Pill	1 Tablet(s)100 mg elemental magnesium per serving	No published price matched to barcode 8 28054 77273 1 as of 2026-10-17.
AOR Advanced Orthomolecular Research Advanced Advanced Magnesium ComplexNIH DSLD 214423 · label 2020-02-26	Single salt unresolved as of 2026-10-17Capsule	1 Capsule(s)Elemental amount unresolved as of 2026-10-17	No published price matched to barcode 6 24917 08333 0 as of 2026-10-17.
AOR Advanced Orthomolecular Research Premium Magnesium Potassium AspartatesNIH DSLD 214686 · label 2020-03-24	Magnesium aspartateCapsule	1 Capsule(s)Elemental amount unresolved as of 2026-10-17	No published price matched to barcode 6 2497 08224 1 as of 2026-10-17.
BIOVEA Magnesium 200 mgNIH DSLD 249072 · label 2021-05-22	Single salt unresolved as of 2026-10-17Capsule	1 Vegetarian Capsule(s)200 mg elemental magnesium per serving	No published price matched to barcode 8 11079 03132 7 as of 2026-10-17.
Bronson Potassium & Magnesium AspartateNIH DSLD 9135 · label 2012-06-01	Magnesium aspartateCapsule	1 Capsule(s)21 mg elemental magnesium per serving	No published price matched to barcode 7 16563 25101 7 as of 2026-10-17.
BulkSupplements.com Magnesium D-AspartateNIH DSLD 310740 · label 2024-03-22	Magnesium aspartatePowder	680 mg (about 1/4 tsp)49 mg elemental magnesium per serving	$35.97 per container; cost per 100 mg not computedObserved 2026-09-11 · provisional (pack weight differs: the offer lists 250 g, the label 1000 g)
BulkSupplements.com Magnesium D-AspartateNIH DSLD 310742 · label 2024-03-22	Magnesium aspartatePowder	680 mg (about 1/4 tsp)49 mg elemental magnesium per serving	No published price matched to barcode X00191LG7V as of 2026-10-17.
BulkSupplements.com Magnesium D-AspartateNIH DSLD 310743 · label 2024-03-22	Magnesium aspartatePowder	680 mg (about 1/4 tsp)49 mg elemental magnesium per serving	No published price matched to barcode X0018VO6HJ as of 2026-10-17.

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

Magnesium hydroxide: trace the filed inputs

8 of 10 labels mentioning magnesium hydroxide are shown in brand order from the supplied NIH DSLD records, calculated 2026-10-17. 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 2026-10-17
Brand / label	Salt / physical state	Filed serving	Observed item price / EC100
Allergy Research Group Magnesium Malate ForteNIH DSLD 233224 · label 2020-08-23	Single salt unresolved as of 2026-10-17Tablet or Pill	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 70740 5 as of 2026-10-17.
Allergy Research Group Magnesium Malate ForteNIH DSLD 304253 · label 2023-12-14	Single salt unresolved as of 2026-10-17Tablet or Pill	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 70740 5 as of 2026-10-17.
BulkSupplements.com Magnesium HydroxideNIH DSLD 310752 · label 2024-03-22	Magnesium hydroxidePowder	1000 mg (about 1/3 tsp)410 mg elemental magnesium per serving	No published price matched to barcode X000J41BKL as of 2026-10-17.
BulkSupplements.com Magnesium HydroxideNIH DSLD 310753 · label 2024-03-22	Magnesium hydroxidePowder	1000 mg (about 1/3 tsp)410 mg elemental magnesium per serving	No published price matched to barcode X0019L9FS3 as of 2026-10-17.
BulkSupplements.com Magnesium HydroxideNIH DSLD 310754 · label 2024-04-23	Magnesium hydroxidePowder	1000 mg (about 1/3 tsp)410 mg elemental magnesium per serving	No published price matched to barcode X000J41BHJ as of 2026-10-17.
Douglas Laboratories Malic Acid + MagnesiumNIH DSLD 232010 · label 2020-08-23	Magnesium hydroxideTablet or Pill	1 Tablet(s)86 mg elemental magnesium per serving	No published price matched to barcode 3 10539 00341 1 as of 2026-10-17.
Irwin Naturals Magnesium + AshwagandhaNIH DSLD 323288 · label 2025-02-23	Single salt unresolved as of 2026-10-17Softgel Capsule	3 Liquid Soft-Gel(s)150 mg elemental magnesium per serving	No published price matched to barcode 8 40081 40432 4 as of 2026-10-17.
NutriCology Magnesium Malate ForteNIH DSLD 235240 · label 2020-09-25	Single salt unresolved as of 2026-10-17Capsule	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 50740 1 as of 2026-10-17.

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 2026-10-17, the published price set contains 0 verified magnesium aspartate matches and 0 verified magnesium hydroxide 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 aspartate: its own retail sample

As of 2026-10-17, magnesium aspartate has 0 verified matches and 3 pending matches in the price set. No verified median is available as of 2026-10-17. Observation dates: 2026-09-11 to 2026-10-26.

0 verified retail matches are published for magnesium aspartate as of 2026-10-17.

Magnesium aspartate · pending observations · reviewed 2026-10-17 · n= 3

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

Magnesium aspartate · pending observations · reviewed 2026-10-17 · n=

BulkSupplements.com	Magnesium D-AspartateNIH DSLD · Label 310740	49 mg	1,471	$35.97Per container · Price observed 2026-09-11, Amazon	Not computedpack weight differs: the offer lists 250 g, the label 1000 g	Pending · provisional
Swanson	Magnesium AspartateNIH DSLD · Label 308656	133 mg	90	$14.84Per container · Price observed 2026-09-11, Amazon	Not computedthe offer is a multi-pack (2 packs)	Pending · provisional
NOW	Magnesium & Potassium AspartateNIH DSLD · Label 204986	250 mg	60	$29.62Per container · Price observed 2026-10-26, Amazon	Not computedthe offer is a multi-pack (2 packs)	Pending · provisional

Open the magnesium aspartate label group →

Magnesium hydroxide: its own retail sample

As of 2026-10-17, magnesium hydroxide has 0 verified matches and 0 pending matches in the price set. No verified median is available as of 2026-10-17. Observation dates: No published observations as of 2026-10-17.

0 verified retail matches are published for magnesium hydroxide as of 2026-10-17.

There are 0 pending price matches for magnesium hydroxide as of 2026-10-17.

Open the magnesium hydroxide 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.