Is magnesium glycinate third party tested?
Our picks, each format ranked separately: Capsules, softgels and tablets: Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules); powders: Thorne Magnesium Bisglycinate (60 servings); gummies and chewables: Nature Made High Absorption Magnesium Glycinate Gummies 100 mg (40 gummies). Where to buy
7 of the 36 magnesium glycinate and bisglycinate products we track are confirmed at the exact package by a certifier. Another 3 sit on certifier listings that name another package size, not the packages we price. One more is not listed itself: the brand's listing for the same ingredient names another form. The remaining 25 appear in no database we searched.
NSF names packages by size and count against each certificate. A brand can sell the same formula in several sizes, or several flavors, and have one of them named, so “this brand is NSF certified” can be true while the package in your hand is not one NSF names. The group “Listed, but not this package” 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.
Confirmed at this exact package, 7
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 |
|---|---|---|---|
| Core Med Science Magnesium Bisglycinate (60 capsules) | Capsules, softgels and tablets | $0.40 | 1810008 |
| Momentous Magnesium Bisglycinate (60 capsules) | Capsules, softgels and tablets | $0.566 | 1808823 |
| Nature Made High Absorption Magnesium Glycinate 200 mg (60 capsules) | Capsules, softgels and tablets | $0.733 | USP Verified, product in directory, mark on label |
| BulkSupplements.com Magnesium Glycinate Powder (1 kg) | Powder | $0.051 | 1809763 |
| Thorne Magnesium Bisglycinate (60 servings) | Powder | $0.867 | 1507934 |
| Thorne Magnesium Bisglycinate, Travel Packs (30 stick packs) | Powder | $1.57 | 1666128 |
| Nature Made High Absorption Magnesium Glycinate Gummies 100 mg (40 gummies) | Gummies and chewables | $2.10 | USP Verified, product in directory, mark on label |
Listed, but not this package, 4
A certifier lists this brand's product, but the listing names another package size, or the same ingredient in another form, and not the package we price. Not a failure, and not a confirmation either.
| Product | Type | Per 200 mg | Certificate |
|---|---|---|---|
| BulkSupplements.com Magnesium Glycinate Capsules (240 count) | Capsules, softgels and tablets | $0.166 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (500 g) | Powder | $0.076 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (250 g) | Powder | $0.134 | 1809763 |
| BulkSupplements.com Magnesium Glycinate Powder (100 g) | Powder | $0.311 | 1809763 |
Searched, and not found, 25
Each of these is absent from every program list we checked it against. Every one was checked against NSF Certified for Sport, and each product page names any other program. These programs certify what a company submits to them, so a product can be absent from a list simply because it was never entered, which is not a finding against it.
NSF Certified for Sport, the Informed programs' published product lists 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 24 products and 24 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.
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.
How these lines are chosen
Among 3 products and 3 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.
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.