Products · Vitamins & minerals · Thorne
Thorne Magnesium Bisglycinate
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A chelated magnesium (bisglycinate) powder listed in NSF’s Certified for Sport database, so an outside tester checks the label. It costs more than basic forms, and the page shows no batch certificate.
Best for People who want a magnesium supplement with an outside tester behind the label, for sleep or general intake, and do not mind paying for it.
- Our quality rating
- Good (4 of 5)
- Verified marks
- NSF Certified for Sport
- Size
- Powder, 60 scoops of 3.77 g (about 226 g)
approx. $52
See it on Thorne’s site →We are not affiliated with Thorne. This link goes to the maker’s own page, with no tracking code. How we're funded.
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How we evaluated it
Why we chose it What put it on our list
- NSF lists the product in its Certified for Sport database: powder, unflavored, 226.2 g, one scoop is 3.77 g (the scoop size on Thorne’s current label), with 21 lots shown. A second listing covers a 187 g pack with a 3.11 g scoop and 12 lots, which does not match that label. Thorne explains the mark as testing for compliance with the label and for nearly 300 banned substances.
- Magnesium bisglycinate is the glycinate form. Our guide to the types of magnesium describes it as well absorbed and the gentlest on the stomach.
- The label is short: 200 mg of magnesium per scoop, with citric acid and monk fruit concentrate as the only other ingredients.
- Thorne says it tests each ingredient for identity, purity and potency, including heavy metals, pesticides and microbes.
Trade-offs What to weigh before you buy
- It costs more than basic forms: about $52 for 60 servings, roughly $0.87 a serving, for 200 mg of magnesium.
- One scoop is more than half of the 350 mg a day upper limit that applies to supplemental magnesium (see our types-of-magnesium guide). Count magnesium from other supplements.
- Thorne’s page shows no certificate of analysis for a batch, and does not say where the powder is made.
- Ask a clinician before taking magnesium if you have kidney disease or take medicines that interact with it.
What to know Details worth knowing first
Magnesium comes in many forms, and our guide to the types explains why glycinate-type forms are often chosen for sleep and for sensitive stomachs. Thorne’s version is magnesium bisglycinate in powder form, with 200 mg of magnesium per scoop.
The reason it is on this list is the NSF listing. Supplements are loosely regulated, so a label can be wrong about the dose or contain something it should not. NSF’s Certified for Sport program tests products against their labels, screens for banned substances, and publishes certified products and lots in a public database. We found this product there.
What we did not find is a batch certificate on Thorne’s page. If that matters to you, ask Thorne for one by lot number. For the basics, see why magnesium matters.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- NSF (Certified for Sport)
| What we checked | What we found |
|---|---|
| Third-party tested Verified | Listed in NSF’s Certified for Sport database as Thorne Magnesium Bisglycinate, powder, unflavored, 226.2 g, one scoop 3.77 g (listing 1507934, 21 lots), which matches the scoop size on Thorne’s current label. A second listing (1205063) covers a 187 g pack with a 3.11 g scoop and 12 lots. Neither shows a certification date or status. |
| Batch certificate of analysis Not verified | None on Thorne’s product page. |
| Contaminant testing Maker’s claim | Thorne says it checks heavy metals, pesticides and microbes in each ingredient. No results are published. |
| The right form and dose Maker’s claim | Magnesium (as magnesium bisglycinate), 200 mg per scoop. |
| A plain label Maker’s claim | Other ingredients: citric acid and monk fruit concentrate. No proprietary blend. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Thorne Magnesium Bisglycinate product page. Maker’s page. Open ↗
- NSF Certified for Sport listing: Thorne Magnesium Bisglycinate (powder, 226.2 g). Certifier or regulator listing. One scoop is 3.77 g, 21 lots shown, as on Thorne’s current label. Open ↗
- NSF Certified for Sport listing: Thorne Magnesium Bisglycinate (powder, 187 g). Certifier or regulator listing. Still listed on 2026-10-22: one scoop is 3.11 g, 12 lots shown. NSF also lists a second Thorne powder, id 1507934 (226.2 g, 3.77 g scoop, 21 lots), which matches Thorne’s current label. Check the pack you are buying. Open ↗
Alternatives Other options to compare
- Momentous Magnesium Bisglycinate Capsules, not powder: 200 mg of magnesium in two capsules, with an NSF Certified for Sport listing and batch certificates the maker posts (two so far). About $17 for 30 servings, roughly $0.57 a serving against Thorne’s $0.87. Whatever you pick, compare the form, the elemental magnesium per serving and a listing for the exact product.
- Food first Magnesium also comes from food. See why it matters and where to get it.