Comparison
Ashwagandha vs Astragalus
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.
Astragalus
Chinese TCM root used for immune support, longevity, and telomerase activation. The TA-65 compound is a purified astragaloside marketed for telomere length.
| Field | Ashwagandha | Astragalus |
|---|---|---|
| Category | adaptogen | adaptogen |
| Dose range | 300–600mg | 500–3000mg |
| Half-life | 6h | — |
| Onset | — | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 650 | 2800 |
The comparison in plain English
Auto-generated from dataAshwagandha and Astragalus are both in the adaptogen category respectively. Ashwagandha Withania somnifera, the most clinically validated herbal adaptogen for stress and anxiety. Astragalus Chinese TCM root used for immune support, longevity, and telomerase activation.
Bottom line
Ashwagandha (evidence A, safety 5/5) has a weaker evidence base than Astragalus (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 Astragalus if
Astragalus is the better fit when your goal aligns with its mechanism (Polysaccharides activate innate immunity through TLR-4 and other receptors) and the dose range (500–3000mg) suits your protocol. Half-life is —h.