Thorne, Magnesium Bisglycinate, 6.5 oz (187 g)
Each scoop supplies 200 mg of elemental magnesium as magnesium bisglycinate, with citric acid and monk fruit as the only other ingredients. The label positions the powder for pre-bedtime use, and the exact 187 g product is listed in NSF's Certified for Sport directory.
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Our Verdict
It ranks first because NSF product-level certification and an unambiguous bisglycinate label dominate the two heaviest criteria. Its clear weakness is value, but that does not outweigh the testing and form advantages.
Score Breakdown
Pros & Cons
Pros
- •Exact 187 g powder is independently listed as NSF Certified for Sport
- •200 mg elemental magnesium from bisglycinate in one scoop with no oxide listed
- •Only citric acid and monk fruit concentrate are listed as other ingredients
Cons
- •At $0.87 per 200 mg serving, it costs about $0.43 per 100 mg elemental magnesium
- •Powder is sweetened with monk fruit, so it is not an unflavored single-ingredient option
Specifications
| Elemental magnesium | 200 mg per serving |
| Magnesium form | Magnesium bisglycinate |
| Serving size | 1 scoop (3.11 g) |
| Servings per container | 60 |
| Added sleep ingredients | None; no melatonin, GABA or L-theanine |
| Third-party verification | NSF Certified for Sport; exact product appears in the current NSF directory |
| Other ingredients / allergens | Citric acid, monk fruit concentrate; gluten-free per label |
Who Is This For?
Best For
- Buyers prioritizing named independent certification
- People who prefer a one-scoop evening powder
Not For
- Value-first buyers
- People who dislike monk-fruit-sweetened powders
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
Natural Factors, Stress-Relax, Nighttime Magnesium Bisglycinate
Natural Factors
One scoop contains 200 mg elemental magnesium as bisglycinate plus 100 mg GABA, 50 mg L-theanine and 2.5 mg melatonin, with every active disclosed. It is explicitly labeled for bedtime and carries the ISURA Verified Clean and Non-GMO marks. This is a multi-ingredient sleep formula, not a magnesium-only product.
California Gold Nutrition, Magnesium Glycinate, 133 mg, 180 Capsules
California Gold Nutrition
The Supplement Facts panel declares 400 mg elemental magnesium from magnesium glycinate per three-capsule serving and no added melatonin, GABA or L-theanine. iHerb marks the SKU iTested and offers a product certificate. The overview also calls the formula buffered without naming a separate buffering salt, which reduces form transparency.
KAL, Chelated Magnesium Bisglycinate, 180 Tablets
KAL
Three tablets provide 315 mg elemental magnesium from fully chelated magnesium bisglycinate, with no added sleep actives. The label markets relaxation support and makes the elemental amount clear. KAL says it is lab-tested for purity and potency, but no named independent certification or public product-specific certificate was found.
Doctor's Best, High Absorption Magnesium, 100 mg, 240 Tablets
Doctor's Best
Two tablets supply 200 mg elemental magnesium from 2,000 mg Albion TRAACS magnesium lysinate glycinate chelate. The product is marketed for muscle relaxation and sleep support and contains no added melatonin, GABA or L-theanine. Its suggested adult use is two tablets twice daily, so the labeled daily regimen is four tablets and 400 mg elemental magnesium.