Ashwagandha (Withania somnifera) is one of the most studied adaptogens in modern sports science. It’s an herb with a 3,000-year history in Ayurvedic medicine, but it’s the last decade of randomised controlled trials that have cemented its place as a legitimate performance supplement.
Ashwagandha and Training — What the Research Shows
- 🧪 Testosterone and recovery — An RCT (Wankhede et al., 2015) on 57 young men found KSM-66 (300mg × 2) significantly increased testosterone by 17% and lean muscle mass by 1.5kg vs placebo over 8 weeks
- 💪 Strength — Same study showed 18–20% greater increases in bench press and leg press vs 8–10% in the placebo group
- 🏃 Endurance and VO2max — A study (Choudhary et al., 2015) showed a 7% improvement in VO2max and significantly lower lactate levels at a given workload
- 📉 Cortisol — Meta-analyses confirm significant cortisol reduction (15–27%) at standard doses
- 💤 Sleep quality — An RCT (Langade et al., 2019) showed improved sleep quality, onset time and total sleep duration
Dose, Timing and Safety
- 📏 Dose: 300–600mg standardised extract (KSM-66 or Sensoril) per day
- ⏱️ Timing: Morning or evening — effect is cumulative, not acute. Take consistently for 8–12 weeks
- ⚠️ Contraindications: Avoid during pregnancy, autoimmune conditions, thyroid disease or if taking immunosuppressive drugs
Summary
Ashwagandha is one of the best-studied adaptogenic supplements with robust evidence for reduced cortisol, improved testosterone, better endurance and sleep quality. It’s not a quick fix — the effect requires consistent intake over weeks. But for those training hard who want to optimise recovery and hormonal status, 300–600mg KSM-66 daily is a well-evidenced addition.
