Most Researched Supplements for Men
These supplements have the strongest men-specific evidence base. Each card links to our full research review.
Testosterone Reality Check
Testosterone optimization is the #1 reason men search for supplements. Here's what the evidence actually shows:
| Supplement | Testosterone Evidence | Verdict |
|---|---|---|
| Ashwagandha | Multiple RCTs show 14-17% increase in total testosterone. Effects are consistent across studies in both stressed and healthy men. | Has real evidence. The most supported natural testosterone supplement. |
| Magnesium | One observational study found correlation with higher testosterone. No RCT has confirmed a causal effect in non-deficient men. | Does not meaningfully raise testosterone. Valuable for other reasons (cardiovascular, sleep). |
| Zinc | Severe zinc deficiency causes low testosterone. Supplementation in zinc-replete men shows inconsistent results. | Unclear. Only likely to help if you're actually deficient. Testing is reasonable before supplementing. |
The honest summary: if your testosterone is low, a supplement is unlikely to fix it. Ashwagandha has the best data, but a 14-17% increase from a normal baseline is modest. If you're experiencing symptoms of low testosterone, get lab work done and talk to a doctor — not a supplement store.
Cardiovascular Priority
Heart disease is the #1 killer of men, and it deserves more attention than testosterone in most men's health conversations. Two supplements have meaningful cardiovascular evidence:
- Magnesium for blood pressure: A meta-analysis of 34 RCTs found magnesium supplementation reduces systolic blood pressure by approximately 2 mmHg and diastolic by 1.78 mmHg. The effect is modest but consistent, and given that ~48% of Americans don't meet the EAR for magnesium, correcting a subclinical deficiency is a reasonable first step.
- Omega-3 for triglycerides: EPA/DHA at doses of 2-4g/day consistently reduce triglycerides by 15-30%. The cardiovascular mortality data is more nuanced (REDUCE-IT showed benefit with high-dose EPA; STRENGTH did not with EPA+DHA), but the triglyceride-lowering effect is well-established.
Neither of these replaces medication if your doctor recommends it. But for men with borderline readings who are looking at lifestyle interventions, these have actual data behind them.