Ashwagandha Dosage: How Much Should You Take? (Science-Backed Guide)

Evidence-Based Guide · 8 min read

The Right Ashwagandha Dose Depends on Your Goal

Most ashwagandha supplements on the market are underdosed. Clinical studies showing real results used 300–600mg/day of KSM-66 or Sensoril extract — not the generic root powder sold in most products.

Recommended Dosages by Goal

KSM-66 vs Sensoril: Which Extract to Choose?

KSM-66 is standardized to ≥5% withanolides from root only — best for energy, testosterone, and athletic performance. Sensoril uses root + leaf, standardized to 10% withanolides — slightly more sedating, better for anxiety and sleep.

For general use, KSM-66 at 600mg/day is the gold standard. A landmark 2019 study in Medicine found this dose reduced cortisol by 28% and increased testosterone by 14.7% in stressed adults.

Cycling Protocol

Ashwagandha is an adaptogen — your body adapts to it over time. The optimal protocol is 8–12 weeks on, 2–4 weeks off. This prevents receptor downregulation and maintains sensitivity to the active withanolides.

Side Effects at Higher Doses

At doses above 1,000mg/day, some users report GI discomfort, loose stools, or excessive sedation. Rare liver toxicity cases have been reported at very high doses (>1,500mg) over extended periods. Always stay within studied dosage ranges.

Contraindications: Pregnancy (stimulates uterine contractions), thyroid disorders (may amplify thyroid hormones), autoimmune conditions (stimulates immune function).

Bottom Line

600mg/day KSM-66 is the sweet spot backed by the most clinical evidence. Buy from a brand that clearly states the extract type, withanolide percentage, and uses third-party testing.

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