Dr. Grey AI

ZMA

ZMA is a patented combination of zinc monomethionine aspartate, magnesium aspartate, and vitamin B6. Marketed for testosterone and athletic performance. REALITY: Independent studies (not funded by patent holder) show NO testosterone or performance benefits in non-deficient individuals. Original testosterone study was funded by patent holder and not replicated. ZMA only benefits those DEFICIENT in zinc or magnesium. Just buy zinc and magnesium separately for less money.

Quick Answer

What it is

ZMA is a patented combination of zinc monomethionine aspartate, magnesium aspartate, and vitamin B6. Marketed for testosterone and athletic performance.

Key findings

  • Grade C: Sleep Quality
  • Grade D: Testosterone Levels
  • Grade D: Muscle Strength

Safety

No specific caution or interaction language was detected in the current summary/outcome notes.

ℹ️ Quick Facts: ZMA

Quick Facts: ZMA

  • Best Evidence:Grade D
  • Conditions Studied:3
  • Research Outcomes:5
  • Key Effect:Aerobic Exercise Performance
Outcomes by grade:
A0
B0
C1
D4
3 conditions · 5 outcomes

Detailed Outcomes

|
C
Sleep Quality
The magnesium component of ZMA has modest evidence from multiple human trials supporting improved sleep quality, particularly in older adults and those with low magnesium status. However, this benefit is attributable to magnesium supplementation broadly, not the specific ZMA formulation. No controlled trials have demonstrated that ZMA provides superior sleep benefits compared to equivalent doses of magnesium alone.
3 studies
small↑Improves
D
Testosterone Levels
One industry-funded RCT (Brilla & Conte, 2000) in NCAA football players reported increased free and total testosterone with ZMA supplementation. However, multiple independent RCTs in resistance-trained males who were not zinc/magnesium deficient found NO significant effect on testosterone levels. The original positive finding has not been replicated by independent researchers, and the evidence overall does not support a testosterone-boosting effect in replete individuals.
4 studies
small↑Improves
D
Muscle Strength
The original patent-holder-funded study reported strength gains in football players supplemented with ZMA. Independent RCTs (e.g., Wilborn et al., 2004) found no significant improvements in muscle strength, power output, or training adaptations compared to placebo in resistance-trained men with adequate zinc and magnesium status. Strength benefits appear limited to individuals correcting an underlying zinc or magnesium deficiency.
3 studies
small↑Improves
D
Aerobic Exercise Performance
Independent studies in trained athletes have found no significant improvement in aerobic exercise performance metrics with ZMA supplementation when participants had adequate baseline zinc and magnesium levels. Any performance benefits observed in other trials are attributed to correcting pre-existing mineral deficiencies rather than a pharmacological effect of the ZMA formulation itself.
2 studies
small↑Improves
D
Body Composition
Independent RCTs (e.g., Wilborn et al., 2004) examined ZMA's effect on lean body mass and fat mass in resistance-trained males and found no significant changes in body composition compared to placebo over 8 weeks of supplementation. The original industry-funded study suggested favorable changes, but this has not been independently replicated.
2 studies
small↑Improves

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