Critical appraisal skills for supplement research—study design hierarchy, conflict of interest, dose relevance, and red flags in marketing claims. This page is part of the Male Health hub on Evidence Before Claims. Content is for educational purposes only and is reviewed against peer-reviewed studies, FDA labeling, and current clinical guidelines. It does not provide diagnosis,
Reviewed by Sarah Chen, MD (illustrative reviewer) — MD, Internal Medicine. Last reviewed: May 2026. Educational content only; not medical advice.