Focus Area← All focus areas

Supplements

Peer-reviewed research concerning supplements, summarized and appraised in plain language with every source cited.

42Studies

42Human studies

2026Most recent

13Countries

Creatine supplementation in young men under resistance versus non-resistance training: a systematic review and meta-analysis of strength, performance, and lean mass.

Frontiers in nutrition2026n = 39 trials

Meta AnalysisHuman

This study set out to see if creatine supplements work differently when taken with resistance training versus other types of exercise. It pooled data from 39 trials in healthy men…

View study →

Vitamin D Supplementation, Total Testosterone, and Androgen Bioavailability Markers in Adult Men: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

Nutrients2026n = 21 comparison-level records from 18 reports

Meta AnalysisHuman

This systematic review and meta-analysis set out to see whether vitamin D supplements raise testosterone or related markers in men. It pooled randomized trials measuring total testosterone, SHBG (sex hormone-binding…

Endocrine Higher Testosterone Low Testosterone

View study →

Effects of astaxanthin supplementation on human sperm quality during the freeze thaw process: a systematic review and meta analysis.

Scientific reports2026

Meta AnalysisHuman

This study set out to examine whether astaxanthin (a potent antioxidant) could improve sperm quality after freezing and thawing. It pooled data from multiple studies to see how astaxanthin affected…

Antioxidants Better Fertility Fertility & Sperm

View study →