Systematic reviews
Every claim traced to the trial that supports it.
10 systematic reviews of clinical trials for individual supplement-and-outcome questions. Each one shows you which studies say what — including the ones that disagree.
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Creatine for Strength and Muscle Performance
37 studies · 1,163 participants · 10 outcomes
8 supported
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Fish Oil for Cardiovascular Health: A Systematic Evidence Review
35 studies · 6,601 participants · 30 outcomes
10 supported 6 no effect 1 mixed
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Ashwagandha for Sleep and Stress: A Systematic Evidence Review
20 studies · 1,594 participants · 12 outcomes
6 supported
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CoQ10 for Heart Failure: A Systematic Evidence Review
18 studies · 2,045 participants · 20 outcomes
10 supported
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Green Tea for Metabolic Health: A Systematic Evidence Review
17 studies · 2,184 participants · 18 outcomes
12 supported 2 no effect 1 mixed
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Resveratrol for Metabolic and Cardiovascular Health: A Systematic Evidence Review
16 studies · 1,038 participants · 22 outcomes
14 supported 2 no effect 2 mixed
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Berberine for Metabolic Health: A Systematic Evidence Review
12 studies · 1,828 participants · 12 outcomes
7 supported 1 no effect
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Rhodiola for Fatigue and Physical Performance
11 studies · 551 participants · 9 outcomes
2 supported 1 no effect
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Ginkgo Biloba for Cognitive Impairment and Dementia: A Systematic Evidence Review
9 studies · 7,471 participants · 27 outcomes
17 supported 7 no effect
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Iron for Cognitive Function: A Systematic Evidence Review
7 studies · 1,459 participants · 13 outcomes
7 supported 4 no effect