Key takeaways
- An adaptogen — helps the body respond to stress rather than blocking it.
- Multiple RCTs show reductions in perceived stress and cortisol.
- Root extract is what most modern research uses.
- Avoid in pregnancy and hyperthyroidism.
What is ashwagandha?
Ashwagandha (Withania somnifera) is a small evergreen shrub native to India and North Africa. Its root has been used in Ayurveda for over 3,000 years as a rasayana — a rejuvenating tonic. The name means 'smell of the horse,' hinting at its earthy aroma and traditional promise of vigor.
Traditional uses
Classical Ayurveda uses ashwagandha for stress, fatigue, weakness, sleep, and reproductive health. It's classified as both a nervine (calming) and a tonic (strengthening) — unusual for a single herb.
Potential wellness benefits
Traditional uses and preliminary research — not medical claims. See safety notes below.
Stress and cortisol
RCTs of 300–600 mg root extract daily show measurable reductions in cortisol and self-reported stress after 8 weeks.
Sleep quality
Studies show improved sleep onset and quality, especially in adults reporting insomnia symptoms.
Energy and endurance
Small athletic-performance studies show improvements in VO₂ max and recovery.
Traditional reproductive support
Used in Ayurveda for men's fertility; some modern trials show improvements in sperm parameters and testosterone levels.
Nutritional profile
- Withanolides (steroidal lactones)
- Alkaloids
- Saponins
- Iron and choline (small amounts)
How to brew ashwagandha
- 1
Ashwagandha milk (traditional)
Whisk ½ tsp ashwagandha root powder into 8 oz warm milk with a pinch of cardamom and a drizzle of honey. Sip 30 min before bed.
- 2
Capsule or extract
Most clinical trials use 300–600 mg of a standardized root extract (KSM-66 or Sensoril) once or twice daily.
- 3
Give it 4–8 weeks
Ashwagandha builds — you feel it as steadier energy and calmer sleep over weeks, not the first dose.
Safety information
Avoid in pregnancy (may cause miscarriage) and while nursing. Skip if you have hyperthyroidism (may raise thyroid hormone). Talk to your provider if you take thyroid, sedative, or immunosuppressant medication. Rare reports of liver issues at very high doses — stick to labeled amounts.
These statements have not been evaluated by the FDA. This herb is not intended to diagnose, treat, cure, or prevent any disease. Talk to a qualified healthcare professional about what's right for you.
Frequently Asked Questions
When should I take ashwagandha?＋
Evening is traditional for the sleep and stress benefits. Some people prefer morning for steady energy — both work.
How long until I notice a difference?＋
Most clinical studies see meaningful changes at 4–8 weeks of daily use.
Can I combine ashwagandha with caffeine?＋
Yes — the two don't cancel out. Some people find ashwagandha smooths out caffeine's edge.