Which magnesium brands are third-party tested?
5 of the 32 magnesium products we track have their exact package named by a certifier. Another 7 come from a product line a certifier lists, but at a package size the certificate does not name. The remaining 20 appear in no database we searched.
The middle group is the one nobody else separates out, and it is the reason this page exists. A certifier lists a specific package against each certificate. A brand may sell the same formula in five sizes and have one of them listed — so “this brand is NSF certified” can be true while the tub in your hand is not the tub NSF tested.
Certifier names this exact package — 5
The strongest evidence available here: the certificate names the package size sold.
| Product | Type | Per 200 mg | Certificate |
|---|---|---|---|
| BulkSupplements.com Magnesium Glycinate Powder (1 kg) | Glycinate | $0.05 | 1809763 |
| BulkSupplements.com Magnesium Citrate Powder (1 kg) | Citrate | $0.052 | 1791472 |
| Core Med Science Magnesium Bisglycinate (60 capsules) | Glycinate | $0.40 | 1810008 |
| Thorne Magnesium Bisglycinate (60 servings) | Glycinate | $0.867 | 1507934 |
| Momentous Magnesium L-Threonate (90 capsules) | L-Threonate | $2.30 | 1496111 |
Listed, but not at this size — 7
The brand and product appear in the database at a different package size. Not a failure, and not a confirmation either.
| Product | Type | Per 200 mg | Certificate |
|---|---|---|---|
| BulkSupplements.com Magnesium Glycinate Powder (500 g) | Glycinate | $0.076 | 1809763 |
| BulkSupplements.com Magnesium Citrate Powder (500 g) | Citrate | $0.08 | 1791472 |
| BulkSupplements.com Magnesium Glycinate Powder (250 g) | Glycinate | $0.128 | 1809763 |
| BulkSupplements.com Magnesium Citrate Powder (250 g) | Citrate | $0.148 | 1791472 |
| BulkSupplements.com Magnesium Glycinate Powder (100 g) | Glycinate | $0.296 | 1809763 |
| BulkSupplements.com Magnesium Citrate Powder (100 g) | Citrate | $0.344 | 1791472 |
| Momentous Magnesium Malate (60 capsules) | Malate | $0.545 | 1409624 |
Searched, and not found — 20
Not listed by any program we checked. Most supplements have never been independently tested, so this usually means nobody looked rather than that anything failed.
Programs searched are those in our methodology. USP, NSF's non-sport database and the Informed programs all refuse automated access, so absences there were checked by hand where they were checked at all — and a product missing from this page has not failed a check, it has not had one.
- Servings per container are derived from net weight rather than read off the label, except where a note on the product says otherwise.
- Most source records have not been checked by a person. The ones that have say so.
- Amazon and Walmart are not included, so “cheapest” means cheapest among the retailers we track.
- Prices go stale. Each one shows when it was last checked, and says so when it is older than the retailer allows us to cache it.
Full comparison of every product in this category: Magnesium. How these numbers are made: How we compare.