Magnesium gluconate
14
labels across all brands · median 133 mg/serving
Brand · NIH DSLD
Mason Natural magnesium labels
Mason Natural files 2 on-market magnesium labels using one salt, citrate, with a median of 325 mg elemental magnesium per serving.
Labels (n)2
Median elemental mg/serving325 mg
Priced in gold set0
Mass budget · computed
What Mason Natural's declared salts weigh
A Supplement Facts panel declares the element; the salt carrying it is heavier. Dividing each label's declared magnesium by its salt's elemental fraction gives the powder mass the serving must contain — and whether that fits a capsule.
| Capsule labels audited | 1 |
|---|---|
| Fit a size 0 or 00 capsule | 0 |
| Require the largest standard size, 000 | 1 |
| Exceed every standard capsule | 0 |
Method and the corpus-wide figure: label mass-budget audit.
Salt portfolio · as filed
Which magnesium salts Mason Natural uses
| Salt | Labels | Elemental fraction | Compound needed per 100 mg |
|---|---|---|---|
| citrate | 1 | 11.3–16.16% | 619–885 mg |
Composition across the portfolio · as filed
What Mason Natural puts in the capsule besides magnesium
- 1 of 2 label lists magnesium stearate. Stearate is 4.1% magnesium by mass and that magnesium is not on the Supplement Facts line; the amount of stearate is not declared, so it cannot be quantified.
- 1 label uses a gelatin shell.
- 1 label uses a cellulose-based shell.
Label declarations · as filed
What Mason Natural claims on its labels
Filed declarations across this brand's labels: 2 distinct filed entries across 2 NIH DSLD labels, counted 2026-09-13; these are manufacturer statements.
- Adult (18 - 50 Years) — on 2 of 2 labels
- Gluten Free — on 1 of 2 labels
What is not known · as of 2026-09-13
Gaps in the record for Mason Natural
- 1 of 2 label does not name the magnesium salt in the filed record, so no compound mass can be computed for it.
- 2 of 2 labels have no US retail listing matched as of 2026-09-13. That is a matching gap on our side, not evidence of unavailability.
Labels 2
| Fast Absorption Magnesium Citrate 250 mgNIH DSLD · Label 336416 · Softgel Capsule | form not mapped yet | 250 mg | 30 | 7.50 g | Not tracked yet |
| Magnesium 200 mgNIH DSLD · Label 244823 · Tablet or Pill | gluconate, oxide | 400 mg | 50 | 20.00 g | Not tracked yet |
Forms filed
Compare within a form
Magnesium oxide
108
labels across all brands · median 310 mg/serving
See all brands, all labels, or the priced form tables.
Filed composition facets
13 published excipient facets occur across 2 labels from Mason Natural in the NIH DSLD records, counted 2026-09-13.
- titanium dioxide: 2 of 2 labels.
- beeswax: 1 of 2 labels.
- croscarmellose sodium: 1 of 2 labels.
- glycerin: 1 of 2 labels.
- hydroxypropyl cellulose: 1 of 2 labels.
- hypromellose: 1 of 2 labels.
- magnesium stearate: 1 of 2 labels.
- maltodextrin: 1 of 2 labels.
- microcrystalline cellulose: 1 of 2 labels.
- silicon dioxide: 1 of 2 labels.
- stearic acid: 1 of 2 labels.
- sunflower lecithin: 1 of 2 labels.
- water: 1 of 2 labels.
The FDA adverse event reporting system (CAERS) holds 6 reports naming Mason Natural as of 2026-09-13. This is a count of submitted reports across all the firm's products; it is not an incidence rate and implies no causation.
The metric
What EC100 measures
EC100 = container price ÷ (elemental mg per serving × servings per container ÷ 100)
It normalizes the declared elemental amount to a 100 mg unit. It does not score ingredients, quality, or outcomes.