Magnesium vs Melatonin
Both are used for sleep better. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Magnesium | Melatonin | |
|---|---|---|
| Human evidence | ★★★★☆ | ★★★★★ |
| Legal status | OTC Supplement | OTC Supplement, Prescription |
| How it works | Cofactor for 300+ enzymes including ATP synthesis (ATP is biologically active as Mg-ATP), and a natural NMDA-receptor gate blocker (reduces neural excitation). Modulates the HPA axis, lowering cortisol. 50–60% of adults under-consume it… | Pineal hormone binding MT1/MT2 receptors (MTNR1A/MTNR1B) in the suprachiasmatic nucleus — shifts the circadian clock rather than sedating. Most people massively overdose it. |
| In plain English | A mineral your body uses in hundreds of reactions and burns through when you train and stress. Topping it up — especially glycinate at night — reliably improves sleep. | The "it's night" hormone. It re-times your body clock, so it's best for jet lag and late sleep phase, not as a sledgehammer sedative. 0.5 mg works as well as 10 mg with less morning fog. |
| Bottom line | Cheap, safe, most athletes are low. Glycinate before bed. | Overused at 10–20× the effective dose. Start at 0.5 mg. |
| Availability | Available over the counter | Prescription only |
Which is better for sleep better?
Melatonin has the stronger human-evidence rating (★★★★★ vs ★★★★☆), but the right choice still depends on your goal, tolerance and budget.
Common questions
Is Magnesium or Melatonin better for sleep better?
Melatonin has the stronger human-evidence rating (★★★★★ vs ★★★★☆), but the right choice still depends on your goal, tolerance and budget.
What's the difference between Magnesium and Melatonin?
Magnesium: Cheap, safe, most athletes are low. Glycinate before bed. — Melatonin: Overused at 10–20× the effective dose. Start at 0.5 mg.