Magnesium citrate
118
labels across all brands · median 217.5 mg/serving
Brand · NIH DSLD
Hard Rhino magnesium labels
Hard Rhino files 2 on-market magnesium labels using 2 different salts, with a median of 227.5 mg elemental magnesium per serving.
Labels (n)2
Median elemental mg/serving227.5 mg
Priced in gold set0
Salt portfolio · as filed
Which magnesium salts Hard Rhino uses
| Salt | Labels | Elemental fraction | Compound needed per 100 mg |
|---|---|---|---|
| citrate | 1 | 11.3–16.16% | 619–885 mg |
| glycinate | 1 | 11.83–14.1% | 709–845 mg |
Label declarations · as filed
What Hard Rhino claims on its labels
Filed declarations across this brand's labels: 4 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 2 of 2 labels
- Dairy Free — on 2 of 2 labels
- No Allergies — on 1 of 2 labels
What is not known · as of 2026-09-13
Gaps in the record for Hard Rhino
- 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
| Magnesium CitrateNIH DSLD · Label 72655 · Powder | citrate | 255 mg | 294 | 74.97 g | Not tracked yet |
| Magnesium GlycinateNIH DSLD · Label 72173 · Powder | glycinate | 200 mg | 2,777 | 555.40 g | Not tracked yet |
Forms filed
Compare within a form
Magnesium glycinate
65
labels across all brands · median 300 mg/serving
See all brands, all labels, or the priced form tables.
The FDA adverse event reporting system (CAERS) holds 2 reports naming Hard Rhino 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.