Astragalus (Astragalus membranaceus)

Tier 2 — promising · Immunity · Adaptogen · Anti-aging

A well-studied traditional Chinese herb with modern immunological evidence. A 2024 review found it significantly improves immune cell counts alongside conventional treatment for respiratory infections and cancer. Contains active compounds called astragalosides. Has centuries of safe traditional use. Avoid if taking immunosuppressant drugs, as it may reduce their effectiveness.

Dose: 500–1,000 mg/day standardised extract (0.4–0.5% astragaloside IV); avoid with immunosuppressants