The magnesium number answers a nutrient question
ODS explains that the Supplement Facts panel declares elemental magnesium rather than the mass of the whole magnesium compound. That number does not identify the source of every component in the tablet, powder or capsule. [1]
Likewise, a salt name such as magnesium citrate describes the ingredient chemistry. It is not a certification that the finished product meets a particular dietary standard. [1]
Check ingredients outside the nutrient panel
FDA notes that supplements can contain other ingredients such as binders, fillers, preservatives, sweeteners and flavorings. Capsule materials and these additional components need consideration when assessing vegan suitability. [2]
If the label does not establish an ingredient’s origin, seek product-specific manufacturer information or a relevant certification. Do not infer suitability from a stock image, a mineral name or a claim about an unrelated product in the same brand. [2]
Equal nutrient amounts can come in different products
Imagine two capsules each provide 100 mg magnesium but use different capsule materials and additives. Their magnesium amounts match; their suitability for a particular dietary preference still requires separate checking.
| Detail | Implication |
|---|---|
| 100 mg magnesium | Nutrient amount |
| Capsule and additives | Additional ingredients |
| Vegan suitability | Product-specific question |
Sources for this article
- NIH ODS: Magnesium
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product. - FDA: Questions and Answers on Dietary Supplements
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.