Comparison
Ashwagandha vs Passionflower
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.
Passionflower
Passiflora incarnata, herbal anxiolytic and sleep aid. Modulates GABA system without strong sedation.
| Field | Ashwagandha | Passionflower |
|---|---|---|
| Category | adaptogen | adaptogen |
| Dose range | 300–600mg | 250–1000mg |
| Half-life | 6h | – |
| Onset | – | – |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 650 | 320 |
The comparison in plain English
Auto-generated from dataAshwagandha and Passionflower are both in the adaptogen category respectively. Ashwagandha Withania somnifera, the most clinically validated herbal adaptogen for stress and anxiety. Passionflower Passiflora incarnata, herbal anxiolytic and sleep aid.
Bottom line
Ashwagandha (evidence A, safety 5/5) has a weaker evidence base than Passionflower (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 Passionflower if
Passionflower is the better fit when your goal aligns with its mechanism (Flavonoids (chrysin, vitexin, apigenin) and other constituents modulate GABA-A receptor signaling) and the dose range (250–1000mg) suits your protocol. Half-life is –h.