Panax ginseng

Tier 3 — weak evidence · Cognitive / Fatigue / Sexual health

May help with mental energy and reduce fatigue, but results are highly inconsistent across studies. Small trials show improvements in working memory and mental fatigue, yet many other trials found no benefit. NCCIH warns it interacts with many common medications including blood thinners and diabetes drugs. Check with your doctor before use.

Dose: 200–400 mg/day standardised extract (minimum 4–7% ginsenosides)