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.
Citrate · 120 capsules
400mg elemental / 200–400mg studied
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Cheap, honest, and a bit of a stomach gamble. NOW's citrate delivers a big 400 mg of elemental magnesium per serving for about $0.31 — real dose, real value. The trade-offs are the form and the testing: citrate has a mild laxative effect at higher doses (some people want that, many don't), and NOW carries no third-party sport certification, which the certified options on this list do.
400 mg elemental magnesium as citrate per three-capsule serving, stated plainly — no blend, no games. That sits at the top of the studied range, which is why the dose bar reads high; just remember more isn't automatically better here, and citrate is the form most likely to loosen your stomach.
Good for anyone who tolerates citrate well and wants the most magnesium per dollar — or who actively wants the mild laxative effect. If magnesium has upset your digestion before, a glycinate is the safer pick.
Reviewed and fact-checked by the NFS editorial team · Last updated 12 Jul 2026