Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Glycinate · powder, 60 servings
200mg elemental / 200–400mg studied
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This is the one we'd hand a friend who just wants magnesium done right. It's magnesium bisglycinate — the chelated form that absorbs well and is gentle on the stomach — at 200 mg of elemental magnesium per scoop, squarely inside the 200–400 mg range the research uses. It also carries NSF Certified for Sport third-party testing, which almost nothing else in this category does. At about $0.78 a serving it is one of the more expensive ways to take magnesium, but you're paying for a clean, verified label, not marketing.
The number that matters is elemental magnesium — the actual magnesium your body gets, not the weight of the whole compound. Thorne states 200 mg of elemental magnesium as bisglycinate per serving. No proprietary blend, no oxide padding the figure. That's the whole point: you can read the label and know exactly what you're getting.
A solid daily magnesium for most people — especially if cheaper citrate or oxide has upset your stomach, since glycinate is easier on digestion. If you only care about lowest cost per milligram, Doctor's Best does the same job for less; if you want the cleanest verified label, this is it.
Reviewed and fact-checked by the NFS editorial team · Last updated 12 Jul 2026