Comparison
Ashwagandha vs Reishi
Ashwagandha
Withania somnifera, the most clinically validated herbal adaptogen for stress and anxiety. Reduces serum cortisol by roughly 28% at 600 mg/day over 8 weeks. Modest evidence for sleep quality and testosterone in men. Choose the KSM-66 extract for the best-studied form.
Reishi
Medicinal mushroom (Ganoderma lucidum) traditionally used for sleep, immunity, and longevity.
| Field | Ashwagandha | Reishi |
|---|---|---|
| Category | adaptogen | adaptogen |
| Dose range | 300–600mg | 1000–3000mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 650 | 460 |
The comparison in plain English
Auto-generated from dataAshwagandha and Reishi are both in the adaptogen category respectively. Ashwagandha Withania somnifera, the most clinically validated herbal adaptogen for stress and anxiety. Reishi Medicinal mushroom (Ganoderma lucidum) traditionally used for sleep, immunity, and longevity.
Bottom line
Ashwagandha (evidence A, safety 5/5) has a weaker evidence base than Reishi (evidence B, safety 5/5). Ashwagandha has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Ashwagandha if
Ashwagandha is the better fit when your goal aligns with its mechanism (Withanolides modulate GABA-A receptors and blunt the HPA-axis cortisol response) and the dose range (300–600mg) suits your protocol. Half-life is 6h.
Choose Reishi if
Reishi is the better fit when your goal aligns with its mechanism (Beta-glucans (the polysaccharide fraction) modulate innate and adaptive immunity through TLR-4 receptor binding) and the dose range (1000–3000mg) suits your protocol. Half-life is —h.