Equal elemental amount · snapshot 2026-08-10

Magnesium carbonate vs Magnesium hydroxide

For 200 mg elemental magnesium, magnesium carbonate requires 694–807 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 24.78–28.83% magnesium by mass for magnesium carbonate 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 carbonate	Magnesium hydroxide
Elemental Mg by compound mass	24.78–28.83%	41.68%
Anhydrous reference formula	MgCO₃	Mg(OH)₂
Molar mass of that reference formula	84.31 g/mol	58.32 g/mol
Composition interval	anhydrous or hydrated; labels rarely state which	One formula fraction used for Mg(OH)₂ in this model.
Compound for 100 mg elemental Mg	347–404 mg	240 mg
Compound for 200 mg elemental Mg	694–807 mg	480 mg
Compound for 400 mg elemental Mg	1,387–1,614 mg	960 mg
Size 00 capsules for 100 mg elemental Mg	1 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 200 mg elemental Mg	1–2 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 400 mg elemental Mg	2–3 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 carbonate: 200 mg worked example

For 200 mg elemental magnesium as magnesium carbonate, the chemistry accompanying the 2026-08-10 snapshot requires 694–807 mg of compound: 200 ÷ 0.2883 through 200 ÷ 0.2478, rounded to whole milligrams.

That requires 1–2 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The mass interval reflects anhydrous or hydrated; labels rarely state which.

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 2026-09-13. 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 carbonate and Magnesium hydroxide · 40 elemental inputs · 2026-09-13
Elemental Mg	Magnesium carbonate: compound mass	Magnesium carbonate: size 0	Magnesium carbonate: size 00	Magnesium carbonate: size 000	Magnesium hydroxide: compound mass	Magnesium hydroxide: size 0	Magnesium hydroxide: size 00	Magnesium hydroxide: size 000
25 mg elemental Mg	87–101 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	173–202 mg compound	1 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	260–303 mg compound	1 capsules at 545 mg fill	1 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	347–404 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 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	434–504 mg compound	1 capsules at 545 mg fill	1 capsules at 730 mg fill	1 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	520–605 mg compound	1–2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 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	607–706 mg compound	2 capsules at 545 mg fill	1 capsules at 730 mg fill	1 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	694–807 mg compound	2 capsules at 545 mg fill	1–2 capsules at 730 mg fill	1 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	780–908 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 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	867–1,009 mg compound	2 capsules at 545 mg fill	2 capsules at 730 mg fill	1 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	954–1,110 mg compound	2–3 capsules at 545 mg fill	2 capsules at 730 mg fill	1–2 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	1,041–1,211 mg compound	2–3 capsules at 545 mg fill	2 capsules at 730 mg fill	1–2 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	1,127–1,312 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 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	1,214–1,412 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 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	1,301–1,513 mg compound	3 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 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	1,387–1,614 mg compound	3 capsules at 545 mg fill	2–3 capsules at 730 mg fill	2 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	1,474–1,715 mg compound	3–4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 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	1,561–1,816 mg compound	3–4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 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	1,648–1,917 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 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	1,734–2,018 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 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	1,821–2,119 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	2 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	1,908–2,220 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 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	1,994–2,320 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 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	2,081–2,421 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 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	2,168–2,522 mg compound	4–5 capsules at 545 mg fill	3–4 capsules at 730 mg fill	2–3 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	2,255–2,623 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 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	2,341–2,724 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 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	2,428–2,825 mg compound	5–6 capsules at 545 mg fill	4 capsules at 730 mg fill	3 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	2,515–2,926 mg compound	5–6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 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	2,601–3,027 mg compound	5–6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 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	2,688–3,128 mg compound	5–6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 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	2,775–3,228 mg compound	6 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3 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	2,862–3,329 mg compound	6–7 capsules at 545 mg fill	4–5 capsules at 730 mg fill	3–4 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	2,948–3,430 mg compound	6–7 capsules at 545 mg fill	5 capsules at 730 mg fill	3–4 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	3,035–3,531 mg compound	6–7 capsules at 545 mg fill	5 capsules at 730 mg fill	3–4 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	3,122–3,632 mg compound	6–7 capsules at 545 mg fill	5 capsules at 730 mg fill	3–4 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	3,208–3,733 mg compound	6–7 capsules at 545 mg fill	5–6 capsules at 730 mg fill	3–4 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	3,295–3,834 mg compound	7–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	3–4 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	3,382–3,935 mg compound	7–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	4 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	3,469–4,036 mg compound	7–8 capsules at 545 mg fill	5–6 capsules at 730 mg fill	4 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 carbonate form group has 0 audited capsule labels and the magnesium hydroxide group has 1; 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 carbonate	23	0	0	0	0
Magnesium hydroxide	10	1	1	0	0

At 2026-08-10, magnesium carbonate 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 23 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 1 of 1 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 9 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 carbonate 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 carbonate	2	2005–2022
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).
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.
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.

Magnesium carbonate: trace the filed inputs

8 of 23 labels mentioning magnesium carbonate 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
Bairn Biologics Magnesium Plus Raspberry Lemonade FlavorNIH DSLD 230669 · label 2020-07-23	Magnesium carbonatePowder	5.7 Gram(s) (1 level scoop)300 mg elemental magnesium per serving	No published price matched to NIH DSLD 230669; barcode not filed as of 2026-09-13.
BIOVEA Calcium-MagnesiumNIH DSLD 248974 · label 2021-05-22	Magnesium oxideCapsule	3 Vegetarian Capsule(s)500 mg elemental magnesium per serving	$14.99 per container; $0.0361 per 100 mgObserved 2026-09-07 · legacy-verified
CVS Pharmacy Natural Calcium, Magnesium & Zinc USPNIH DSLD 12010 · label 2012-08-24	Magnesium oxideUnknown	1 Caplet(s)133 mg elemental magnesium per serving	No published price matched to barcode 0 50428 06542 6 as of 2026-09-13.
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium ComplexNIH DSLD 9831 · label 2012-06-01	Single salt unresolved as of 2026-09-13Tablet or Pill	4 Tablet(s)420 mg elemental magnesium per serving	No published price matched to barcode 3 10539 01579 7 as of 2026-09-13.
Douglas Laboratories Dyna-Cal Extra-Strength Natural Calcium/Magnesium ComplexNIH DSLD 9832 · label 2012-06-01	Single salt unresolved as of 2026-09-13Tablet or Pill	4 Tablet(s)420 mg elemental magnesium per serving	No published price matched to barcode 3 10539 01239 0 as of 2026-09-13.
Family Wellness Calcium, Magnesium & ZincNIH DSLD 76776 · label 2017-07-25	Single salt unresolved as of 2026-09-13Tablet or Pill	1 Tablet(s)133 mg elemental magnesium per serving	No published price matched to barcode 0 32251 02718 5 as of 2026-09-13.
Finest Nutrition Calcium, Magnesium & ZincNIH DSLD 64451 · label 2016-09-22	Single salt unresolved as of 2026-09-13Tablet or Pill	1 Tablet(s)133 mg elemental magnesium per serving	No published price matched to barcode 3 11917 13950 0 as of 2026-09-13.
GNC Magnesium Powder LemonNIH DSLD 243047 · label 2021-01-22	Single salt unresolved as of 2026-09-13Powder	4 Gram(s) (1 Scoop)325 mg elemental magnesium per serving	$22.99 per container; $0.0842 per 100 mgObserved 2026-09-07 · legacy-verified

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 2026-09-13. 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
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.
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 2026-09-13.
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 2026-09-13.
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 2026-09-13.
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 2026-09-13.
Irwin Naturals Magnesium + AshwagandhaNIH DSLD 323288 · label 2025-02-23	Magnesium hydroxideSoftgel Capsule	3 Liquid Soft-Gel(s)150 mg elemental magnesium per serving	No published price matched to barcode 8 40081 40432 4 as of 2026-09-13.
NutriCology Magnesium Malate ForteNIH DSLD 235240 · label 2020-09-25	Single salt unresolved as of 2026-09-13Capsule	1–2 Tablet(s)124 mg elemental magnesium per serving	No published price matched to barcode 7 13947 50740 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.

Retail observations · after chemistry and evidence

Price observations within each salt

As of 2026-09-13, the published price set contains 0 verified magnesium carbonate 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 carbonate: its own retail sample

As of 2026-09-13, magnesium carbonate 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 carbonate as of 2026-09-13.

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

Open the magnesium carbonate label group →

Magnesium hydroxide: its own retail sample

As of 2026-09-13, magnesium hydroxide 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 hydroxide as of 2026-09-13.

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

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.