Equal elemental amount · snapshot 2026-08-10

Magnesium gluconate vs Magnesium hydroxide

For 200 mg elemental magnesium, magnesium gluconate requires 3,413 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 5.86% magnesium by mass for magnesium gluconate 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 gluconate	Magnesium hydroxide
Elemental Mg by compound mass	5.86%	41.68%
Anhydrous reference formula	Mg(C₆H₁₁O₇)₂	Mg(OH)₂
Molar mass of that reference formula	414.60 g/mol	58.32 g/mol
Composition interval	One formula fraction used for Mg(C₆H₁₁O₇)₂ in this model.	One formula fraction used for Mg(OH)₂ in this model.
Compound for 100 mg elemental Mg	1,706 mg	240 mg
Compound for 200 mg elemental Mg	3,413 mg	480 mg
Compound for 400 mg elemental Mg	6,826 mg	960 mg
Size 00 capsules for 100 mg elemental Mg	3 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 200 mg elemental Mg	5 capsules at 730 mg compound fill each	1 capsules at 730 mg compound fill each
Size 00 capsules for 400 mg elemental Mg	10 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 gluconate: 200 mg worked example

For 200 mg elemental magnesium as magnesium gluconate, the chemistry accompanying the 2026-08-10 snapshot requires 3,413 mg of compound: 200 ÷ 0.0586, rounded to whole milligrams.

That requires 5 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The model uses the Mg(C₆H₁₁O₇)₂ fraction throughout.

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 gluconate and Magnesium hydroxide · 40 elemental inputs · 2026-09-13
Elemental Mg	Magnesium gluconate: compound mass	Magnesium gluconate: size 0	Magnesium gluconate: size 00	Magnesium gluconate: size 000	Magnesium hydroxide: compound mass	Magnesium hydroxide: size 0	Magnesium hydroxide: size 00	Magnesium hydroxide: size 000
25 mg elemental Mg	427 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	853 mg compound	2 capsules at 545 mg fill	2 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	1,280 mg compound	3 capsules at 545 mg fill	2 capsules at 730 mg fill	2 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	1,706 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	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	2,133 mg compound	4 capsules at 545 mg fill	3 capsules at 730 mg fill	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	2,560 mg compound	5 capsules at 545 mg fill	4 capsules at 730 mg fill	3 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	2,986 mg compound	6 capsules at 545 mg fill	5 capsules at 730 mg fill	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	3,413 mg compound	7 capsules at 545 mg fill	5 capsules at 730 mg fill	4 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	3,840 mg compound	8 capsules at 545 mg fill	6 capsules at 730 mg fill	4 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	4,266 mg compound	8 capsules at 545 mg fill	6 capsules at 730 mg fill	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	4,693 mg compound	9 capsules at 545 mg fill	7 capsules at 730 mg fill	5 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	5,119 mg compound	10 capsules at 545 mg fill	8 capsules at 730 mg fill	5 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	5,546 mg compound	11 capsules at 545 mg fill	8 capsules at 730 mg fill	6 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	5,973 mg compound	11 capsules at 545 mg fill	9 capsules at 730 mg fill	6 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	6,399 mg compound	12 capsules at 545 mg fill	9 capsules at 730 mg fill	6 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	6,826 mg compound	13 capsules at 545 mg fill	10 capsules at 730 mg fill	7 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	7,253 mg compound	14 capsules at 545 mg fill	10 capsules at 730 mg fill	7 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	7,679 mg compound	15 capsules at 545 mg fill	11 capsules at 730 mg fill	7 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	8,106 mg compound	15 capsules at 545 mg fill	12 capsules at 730 mg fill	8 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	8,532 mg compound	16 capsules at 545 mg fill	12 capsules at 730 mg fill	8 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	8,959 mg compound	17 capsules at 545 mg fill	13 capsules at 730 mg fill	9 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	9,386 mg compound	18 capsules at 545 mg fill	13 capsules at 730 mg fill	9 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	9,812 mg compound	19 capsules at 545 mg fill	14 capsules at 730 mg fill	9 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	10,239 mg compound	19 capsules at 545 mg fill	15 capsules at 730 mg fill	10 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	10,666 mg compound	20 capsules at 545 mg fill	15 capsules at 730 mg fill	10 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	11,092 mg compound	21 capsules at 545 mg fill	16 capsules at 730 mg fill	11 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	11,519 mg compound	22 capsules at 545 mg fill	16 capsules at 730 mg fill	11 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	11,945 mg compound	22 capsules at 545 mg fill	17 capsules at 730 mg fill	11 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	12,372 mg compound	23 capsules at 545 mg fill	17 capsules at 730 mg fill	12 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	12,799 mg compound	24 capsules at 545 mg fill	18 capsules at 730 mg fill	12 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	13,225 mg compound	25 capsules at 545 mg fill	19 capsules at 730 mg fill	13 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	13,652 mg compound	26 capsules at 545 mg fill	19 capsules at 730 mg fill	13 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	14,078 mg compound	26 capsules at 545 mg fill	20 capsules at 730 mg fill	13 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	14,505 mg compound	27 capsules at 545 mg fill	20 capsules at 730 mg fill	14 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	14,932 mg compound	28 capsules at 545 mg fill	21 capsules at 730 mg fill	14 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	15,358 mg compound	29 capsules at 545 mg fill	22 capsules at 730 mg fill	14 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	15,785 mg compound	29 capsules at 545 mg fill	22 capsules at 730 mg fill	15 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	16,212 mg compound	30 capsules at 545 mg fill	23 capsules at 730 mg fill	15 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	16,638 mg compound	31 capsules at 545 mg fill	23 capsules at 730 mg fill	16 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	17,065 mg compound	32 capsules at 545 mg fill	24 capsules at 730 mg fill	16 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 gluconate form group has 2 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 gluconate	20	2	2	0	0
Magnesium hydroxide	10	1	1	0	0

At 2026-08-10, magnesium gluconate has 2 of 2 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 18 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 gluconate 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 gluconate	2	1992–2005
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.
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.

Magnesium gluconate: trace the filed inputs

8 of 20 labels mentioning magnesium gluconate 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.
BulkSupplements.com Magnesium Gluconate 500 mgNIH DSLD 294869 · label 2023-08-23	Magnesium gluconateCapsule	3 Capsule(s)80 mg elemental magnesium per serving	No published price matched to barcode X000TO2K8X as of 2026-09-13.
BulkSupplements.com Magnesium Gluconate 500 mgNIH DSLD 294870 · label 2023-07-18	Magnesium gluconateCapsule	3 Capsule(s)80 mg elemental magnesium per serving	No published price matched to barcode X000TO2L19 as of 2026-09-13.
DC MagnesiumNIH DSLD 265884 · label 2022-04-11	Single salt unresolved as of 2026-09-13Tablet or Pill	1 Tablet(s)133 mg elemental magnesium per serving	No published price matched to NIH DSLD 265884; barcode not filed as of 2026-09-13.
Douglas Laboratories Magnesix Magnesium And B-6NIH DSLD 26807 · label 2013-10-25	Magnesium oxideTablet or Pill	1 Tablet(s)50 mg elemental magnesium per serving	$11.50 per container; $0.2300 per 100 mgObserved 2026-09-07 · legacy-verified
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.
Freeda Magnesium GluconateNIH DSLD 246217 · label 2021-03-25	Magnesium gluconateTablet or Pill	4 Tablet(s)110 mg elemental magnesium per serving	No published price matched to barcode 7 58487 01751 5 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 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 gluconate 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 gluconate: its own retail sample

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

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

Open the magnesium gluconate 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.