Comparison
Ashwagandha vs Chaga
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.
Chaga
Birch-tree mushroom (Inonotus obliquus) traditionally used in Russia/Siberia for immune and antioxidant support.
| Field | Ashwagandha | Chaga |
|---|---|---|
| Category | adaptogen | adaptogen |
| Dose range | 300–600mg | 1000–3000mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●○ |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 650 | 280 |
The comparison in plain English
Auto-generated from dataAshwagandha and Chaga are both in the adaptogen category respectively. Ashwagandha Withania somnifera, the most clinically validated herbal adaptogen for stress and anxiety. Chaga Birch-tree mushroom (Inonotus obliquus) traditionally used in Russia/Siberia for immune and antioxidant support.
Bottom line
Ashwagandha (evidence A, safety 5/5) has a weaker evidence base than Chaga (evidence B, safety 4/5). 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 Chaga if
Chaga is the better fit when your goal aligns with its mechanism (Polysaccharides (beta-glucans), betulinic acid (from the birch tree the fungus grows on), and melanin compounds contribute to antioxidant and immunomodulatory effects) and the dose range (1000–3000mg) suits your protocol. Half-life is —h.