Supplement
Magnesium
Essential mineral, noisy marketing. Here is what the trials say.
Magnesium is a mineral involved in hundreds of processes in the body, including muscle function, nerve signaling, and energy production. We grade Magnesium B- on evidence and B+ for worth-it at about $8-15 per month.
Evidence
Worth it
Typical cost: $8-15/month
What it does
Magnesium is a mineral involved in hundreds of processes in the body, including muscle function, nerve signaling, and energy production. Many adults get less than recommended amounts from diet alone.
What the research says
Corrects magnesium deficiency
Evidence: strong. Deficiency is measurable and supplementation corrects it; this part is not controversial.
May improve subjective sleep quality
Evidence: emerging. Some small trials show benefit; larger, high-quality RCTs are still needed. Needs verification.
May reduce muscle cramps
Evidence: weak. Evidence is mixed and mostly anecdotal for exercise-associated cramps. Needs verification.
DRAFT: correcting deficiency is well established, but the popular sleep and cramp claims rest on thinner evidence. Grade reflects the gap between marketing claims and trial data.
What the experts say
Every position links to its source. We include skeptics alongside supporters.
Andrew Huberman
“You might consider taking (30-60 min before bed): 145mg Magnesium Threonate or 200mg Magnesium Bisglycinate”
Source, 2021 Includes 145mg magnesium threonate (or 200mg bisglycinate) in his nightly sleep stack, taken 30-60 minutes before bed.
Mark Hyman
“I call magnesium the relaxation mineral, because it just relaxes everything.”
Source Calls magnesium 'the relaxation mineral'; takes 400-600mg at night himself and recommends glycinate or citrate forms over oxide.
Rhonda Patrick
Source Takes magnesium nightly as the relaxation mineral, noting half the population runs suboptimal and that magnesium supports DNA repair pathways; magnesium glycinate is her preferred form.
Gary Brecka
Source Describes magnesium as a commonly deficient mineral, recommending 200-400mg of magnesium threonate 30-60 minutes before bed to support sleep, digestion, and calm in place of tranquilizing sleep medications.
Matthew Walker
“The literature for magnesium for sleep, in general, does not provide compelling evidence”
Source Skeptical that magnesium improves sleep in people with healthy levels: the sleep literature does not provide compelling evidence, though he notes benefits shown in older adults with insomnia.
Is it worth it?
DRAFT: cheap and useful for correcting low intake; grade held back because the headline sleep claims outrun the trial data.
Typical cost
$8-15/month
Common form, not a brand recommendation
Dosage contextestablished
200 to 400 mg elemental magnesium per day is the common studied range; forms differ more in digestive tolerance than in proven effect.
Safety notes
Magnesium from food is safe for nearly everyone. Supplemental doses can cause digestive upset, and high doses can be risky for people with kidney problems. Different forms (glycinate, citrate, oxide) are marketed for different uses; absorption claims need verification. Talk to your doctor before supplementing, especially with kidney conditions or medications. This page is information, not medical advice.
Longevity Lab Report
Magnesium news, graded when it happens.
New studies, dose debates, and expert shifts on magnesium, in one email a week. Free.
Changelog
Last updated 2026-10-15
- 2026-10-15|Seed entry created as DRAFT. Sleep and cramp claims marked needs verification.
- 2026-10-15|Dosage context added.
- 2026-10-15|Goal tags added for the stack builder.
- 2026-10-15|Expert position sourced for Andrew Huberman.
- 2026-10-15|Expert position sourced for Mark Hyman.