2.5/5
Weak
evidence
Micronutrient evidence brief
Zinc
Important for normal physiology, but supplementation is not a proven strength, testosterone, or hypertrophy aid in replete lifters.
Headline Finding
ZMA RCT: no rise in total/free T or training adaptations in 42 trained men.
Dose Context
Use intake review or labs where appropriate. Avoid chronic high-dose use without copper and clinical context.
Important Caveat
Marketed testosterone claims should be treated as deficiency-correction claims, not anabolic claims.
Source Drawer
Linked Research
- Systematic review Mineral performance systematic review
- Full text Mineral review full text
- Meta-analysis Acute exercise zinc meta-analysis
- Trial Athlete hematology trial
- Trial ZMA resistance trial
How To Read This Rating
The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
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