Best magnesium for sleep, by form and elemental dose

Our pick. Bisglycinate chelate, ~200 mg elemental per scoop, no oxide filler, NSF Certified for Sport (third-party tested for label accuracy). The form with the best absorption-to-tolerability ratio for sleep, and the glycine carrier may add a mild calming contribution. Powder format; mix one scoop in water 30-60 min before bed.

Capsule alternative to a powder. Glycinate form, ~120 mg elemental per capsule, so most people take 1-2 to reach the 200-400 mg window. Hypoallergenic line, third-party tested. Best for readers who want the glycinate form without measuring a powder, and who will check how many capsules the elemental target actually requires.

TRAACS-chelated magnesium bis-glycinate/lysinate. ~100 mg elemental per tablet, so 2 tablets reach ~200 mg. Well-absorbed chelate at a lower price per elemental mg than most. Caveat: it is a fairly large tablet, and the dose is the count that hits your elemental target, not the marketing number on the front.

Threonate is marketed for crossing the blood-brain barrier and raising brain magnesium in animal work, but elemental content is low (~144 mg elemental across the typical ~2,000 mg Magtein daily dose) and it costs more per elemental mg. [VERIFY: direct human RCT evidence for threonate improving sleep specifically is thin and mostly small or industry-linked.] Reasonable only if cognitive endpoints, not just sleep, are the goal.

Best-selling effervescent citrate powder, ~325 mg elemental per recommended dose. Citrate is genuinely absorbable, but at sleep doses it draws water into the gut and is laxative-leaning, which is why it doubles as a constipation remedy. Fine if you tolerate it and want the elemental dose, but start at a half-serving to test gut tolerance.

The cheapest and most common form on shelf labels, and the wrong one for sleep. Oxide is roughly 4% bioavailable (Firoz & Graff 2001), so a '400 mg' oxide tablet delivers very little usable magnesium and mostly produces a laxative effect. High elemental number on paper, low delivered dose in practice. Listed here only to be recognized and skipped.

Malate (magnesium bound to malic acid) is well-absorbed and often used for daytime energy and muscle complaints because malic acid feeds the citric acid cycle. There is no specific sleep-onset rationale and some users find it mildly activating, so it belongs in a morning or midday slot rather than the pre-bed one. Included to clarify that not every absorbable form is a bedtime form.