Which magnesium brands are third-party tested?
Our pick for each type, capsules and powder ranked separately: Glycinate, capsules: Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules); Glycinate, powder: Thorne Magnesium Bisglycinate (60 servings); Citrate, capsules: Nature Made High Absorption Magnesium Citrate 250 mg (120 softgels); Citrate, powder: BulkSupplements.com Magnesium Citrate Powder (1 kg) (before delivery); L-Threonate: Momentous Magnesium L-Threonate (90 capsules) (before delivery). Types with no certified product are listed below. Where to buy
10 of the 75 magnesium products we track have their exact package named by a certifier. Another 10 come from a product line a certifier lists, but at a package size the certificate does not name. The remaining 55 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, 10
The strongest evidence available here: the certificate names the package size sold.
| Product | Type | Per 200 mg | Certificate |
|---|---|---|---|
| BulkSupplements.com Magnesium Citrate Powder (1 kg) | Citrate | $0.049 | 1791472 |
| BulkSupplements.com Magnesium Glycinate Powder (1 kg) | Glycinate | $0.05 | 1809763 |
| Nature Made High Absorption Magnesium Citrate 250 mg (120 softgels) | Citrate | $0.315 | USP Verified, product in directory, mark on label |
| Nature Made High Absorption Magnesium Citrate 250 mg (60 softgels) | Citrate | $0.378 | USP Verified, product in directory, mark on label |
| Core Med Science Magnesium Bisglycinate (60 capsules) | Glycinate | $0.40 | 1810008 |
| Momentous Magnesium Bisglycinate (60 capsules) | Glycinate | $0.566 | 1808823 |
| Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules) | Glycinate | $0.733 | USP Verified, product in directory, mark on label |
| Thorne Magnesium Bisglycinate (60 servings) | Glycinate | $0.867 | 1507934 |
| Thorne Magnesium Bisglycinate, Travel Packs (30 stick packs) | Glycinate | $1.57 | 1666128 |
| Momentous Magnesium L-Threonate (90 capsules) | L-Threonate | $2.30 | 1496111 |
Listed, but not at this size, 10
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 Citrate Capsules (360 count) | Citrate | $0.128 | 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 Capsules (240 count) | Glycinate | $0.166 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (100 g) | Glycinate | $0.296 | 1809763 |
| BulkSupplements.com Magnesium Citrate Powder (100 g) | Citrate | $0.327 | 1791472 |
| Momentous Magnesium Malate (60 capsules) | Malate | $0.545 | 1409624 |
| BulkSupplements.com Magnesium Citrate Softgels (240 count) | Citrate | $0.666 | 1791472 |
Searched, and not found, 55
Not listed by any program we checked. These programs certify what a company submits to them, so a product can be absent from their databases simply because it was never entered, which is not a finding against it.
Programs searched are those in our methodology: NSF Certified for Sport, the Informed programs' published product lists, the IFOS directory and USP's directory, each read in full, with the day on each product page. A product missing from this page has not failed a check. It has not had one.
Where to buy: the pick for each type
The pick is the cheapest certified product, at the exact package sold where the certifier names packages, with no adverse finding on record, a price its retailer let us read recently, and no more than a year’s supply at the label’s serving; per delivered dose where the retailer publishes a delivery rate. Where none does, it is the cheapest such product before delivery, and it says how far the order is from free delivery. It is the same pick the category page shows.
How these lines are chosen
Among 19 products and 19 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
How these lines are chosen
Among 8 products and 8 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
How these lines are chosen
Among 9 products and 9 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
How these lines are chosen
Among 5 products and 5 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below. No product here publishes a delivery rate below its free-delivery threshold, so the pick is priced before delivery.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
How these lines are chosen
Among 7 products and 7 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below. No product here publishes a delivery rate below its free-delivery threshold, so the pick is priced before delivery.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
Full comparison of every product in this category: Magnesium. Every question we answer: the question index.
What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.