ZMA

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

Male LibidoSexual HealthSmallCNo linked study

Immune SupportSmallCNo linked study

Bone densityBone & JointSmallCNo linked study

Sleep qualitySleepSmallCNo linked study

Muscle RecoveryFitnessSmallCNo linked study

Strength TrainingFitnessSmallCNo linked study

All 9 rated effectsGrouped by health goal, with the publications behind each rating

What is ZMA?

ZMA combines zinc, magnesium and vitamin B6; the 2004 trial product also contained other ingredients. 1

Why study minerals for training?

Zinc contributes to protein synthesis, and magnesium supports muscle and nerve function. Those established nutrient roles provide a rationale for studying supplementation; they do not by themselves demonstrate an extra training benefit from a ZMA blend. 2 3 4

Why people take it

Fitness18.7%

Essential Health15.4%

Men's Hormones14.3%

Energy13.2%

Sleep12.1%

Stress & Mood8.8%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Questions people ask

Is ZMA a testosterone booster?

The eight-week trial did not find a hormone advantage over placebo in resistance-trained men. 4

Does ZMA replace lost sleep?

It did not improve sleep or next-morning performance in the short sleep-restriction study. 5

Can I add ZMA to a multivitamin?

Overlapping ingredients matter: EFSA’s 12 mg adult vitamin B6 limit includes food and every supplement. 6

Is it harmless because it contains minerals?

No. Magnesium supplements can cause diarrhea, and impaired kidney function increases magnesium toxicity risk. 3