Ashwagandha: Complete Guide to Benefits, Dosage, and Safety
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What Is Ashwagandha
Ashwagandha (Withania somnifera) is an Ayurvedic herb classified as an adaptogen — it helps the body adapt to physiological and psychological stress. Active compounds are withanolides — steroidal lactones that interact with the stress-response HPA axis. The root is most studied; leaf extracts are used in some formulas (notably Sensoril).
What the Evidence Shows
Stress and cortisol: Multiple RCTs show significant reductions in perceived stress, anxiety scores, and morning cortisol at 300–600 mg/day KSM-66 for 8–12 weeks. Effect size is moderate — meaningful but not dramatic. Sleep: 300 mg Sensoril before bed improved sleep quality, onset, and total sleep time in two double-blind trials. Testosterone: Two RCTs in stressed/infertile men found significant testosterone increases — effect not replicated in healthy men with normal T.
KSM-66 vs Sensoril
KSM-66 (root extract, 5% withanolides): most studied, good for daytime stress and general adaptogenic effects. Sensoril (root + leaf, 10% withanolides): higher withanolide content per dose (only 125–250 mg needed), stronger sedative profile — better for sleep. Both are branded, standardized, and backed by clinical trials. Avoid unbranded ashwagandha powder of unknown potency.
Thyroid Considerations
Ashwagandha stimulates thyroid hormone production in some studies. For people with hypothyroidism: may be beneficial but can also interfere with thyroid medications. For people with hyperthyroidism or Hashimoto’s thyroiditis: may worsen thyroid overactivity or trigger autoimmune flares. Monitor thyroid function if using ashwagandha with thyroid conditions.
Safety and Contraindications
Rare but real: hepatotoxicity (liver toxicity) cases reported — mostly from non-standardized products. Choose reputable brands with standardized extracts. Avoid in pregnancy (uterotonic effects — may cause miscarriage). Avoid if immunosuppressed (immunostimulatory). May interact with sedatives, thyroid medications, and immunosuppressants. Cycling: some practitioners recommend 8 weeks on, 2–4 weeks off — though evidence for cycling is limited.
Practical Dosing Protocol
For stress and anxiety: KSM-66 300 mg twice daily (morning and evening) or once daily at 600 mg. For sleep: Sensoril 250 mg 30–60 minutes before bed. For athletic performance and testosterone: 600 mg KSM-66 with training. Give it 4–8 weeks for full effects. Don’t expect dramatic overnight change — ashwagandha’s mechanism is cumulative.
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