Is magnesium glycinate third party tested?
Our picks, capsules and powder ranked separately: Capsules: Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules); powder: Thorne Magnesium Bisglycinate (60 servings). Where to buy
6 of the 27 magnesium glycinate and bisglycinate products we track have their exact package named by a certifier. Another 4 come from a product line a certifier lists, but at a package size the certificate does not name. The remaining 17 appear in no database we searched.
A certifier lists a specific package against each certificate. A brand can sell the same formula in several sizes, or several flavors, 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. The middle group below is that gap.
Glycinate and bisglycinate are the same salt under two names. NSF names packages, not product lines, so a brand can be certified at one bag size and only “listed” at the next; both are shown here as they are. Every magnesium salt, by package.
Certifier names this exact package, 6
The strongest evidence available here. For NSF, the listing names the package size sold; it was opened, its package text recorded, and its ID is on the product page. For USP, which names products rather than packages, the product is in USP's directory and the USP Verified Mark is on this package's own label, and both are on the product page.
| Product | Type | Per 200 mg | Certificate |
|---|---|---|---|
| BulkSupplements.com Magnesium Glycinate Powder (1 kg) | Powder | $0.05 | 1809763 |
| Core Med Science Magnesium Bisglycinate (60 capsules) | Capsules | $0.40 | 1810008 |
| Momentous Magnesium Bisglycinate (60 capsules) | Capsules | $0.566 | 1808823 |
| Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules) | Capsules | $0.733 | USP Verified, product in directory, mark on label |
| Thorne Magnesium Bisglycinate (60 servings) | Powder | $0.867 | 1507934 |
| Thorne Magnesium Bisglycinate, Travel Packs (30 stick packs) | Capsules | $1.57 | 1666128 |
Listed, but not at this size, 4
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) | Powder | $0.076 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (250 g) | Powder | $0.128 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Capsules (240 count) | Capsules | $0.166 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (100 g) | Powder | $0.296 | 1809763 |
Searched, and not found, 17
Not listed by NSF Certified for Sport when we read its full directory. These programs certify what a company submits to them, so a product can be absent from the database simply because it was never entered, which is not a finding against it.
NSF Certified for Sport, the Informed programs' published product lists, the IFOS directory and USP's directory are each read in full, and each product page names the day. A product missing from this page has not failed a check. It has not had one.
Where to buy: the magnesium glycinate shortlist
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. Any answer shown beside it is the cheapest under a different rule and says so on its own line; answers that cost more than the pick fold under one line until you ask for them.
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.
BulkSupplements.com Magnesium Glycinate Powder (1 kg): its panel names Magnesium Glycinate and Magnesium Oxide, so its price is for a blend, not for magnesium glycinate alone.
Full comparison of every product in this category: Magnesium Glycinate. 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.