What is Ashwagandha?
Ashwagandha (Withania somnifera) is a medicinal herb used for over 3,000 years in Ayurvedic medicine. It is classified as an adaptogen — a substance that helps the body resist physiological and psychological stress. The primary active compounds are withanolides, a class of steroidal lactones concentrated in the root. Modern research has validated several traditional uses, particularly for stress, anxiety, testosterone, and physical performance.
Evidence-Based Benefits of Ashwagandha
Stress & cortisol reduction
A double-blind RCT (n=64) found 300 mg KSM-66 twice daily for 60 days reduced serum cortisol by 27.9% and significantly reduced perceived stress scores versus placebo.
Anxiety relief
Meta-analysis of 5 RCTs showed statistically significant reduction in anxiety and stress. Effect sizes are moderate (SMD −0.69 to −1.06 across studies).
Testosterone & male fertility
High-concentration root extract significantly increased testosterone levels (average +15–40%) and improved sperm count, motility, and morphology in infertile men.
Physical performance
400–600 mg/day improved VO2 max, muscle strength, and recovery in both trained and untrained individuals in multiple RCTs.
Sleep quality
600 mg root extract for 12 weeks improved sleep onset latency, total sleep time, and sleep efficiency in adults with insomnia (p<0.05 vs. placebo).
Cognitive function
300 mg KSM-66 twice daily for 8 weeks improved memory, reaction time, and task performance in a double-blind RCT.
Best Forms of Ashwagandha to Buy
Not all forms of ashwagandha are created equal. Bioavailability — how much the body actually absorbs and uses — varies significantly between forms. Ranked from most to least recommended:
Dosage Guide
Drug & Supplement Interactions
Always inform your doctor or pharmacist if you are taking ashwagandha alongside prescription medications. Key interactions to be aware of:
Signs of Ashwagandha Deficiency
Top Food Sources of Ashwagandha
Safety & Side Effects
⚠ Safety Information
Well-tolerated in most people at standard doses. Rare reports of liver injury at very high doses — use reputable standardised extracts. Contraindicated in pregnancy (may stimulate uterine contractions). Not recommended for people with autoimmune conditions (lupus, MS, rheumatoid arthritis) without medical supervision.
This information is for educational purposes only. Always consult a qualified healthcare professional before starting any supplement, especially if you have a medical condition or take medications.
References & Clinical Citations
- Chandrasekhar K et al. (2012). Indian J Psychol Med. High-concentration ashwagandha root extract for stress.
- Pratte MA et al. (2014). J Int Soc Sports Nutr. An alternative treatment for anxiety.
- Wankhede S et al. (2015). J Int Soc Sports Nutr. Ashwagandha on muscle strength and recovery.
- NIH National Center for Complementary and Integrative Health. Ashwagandha.