Ashwagandha Dosage Chart
Ashwagandha (Withania somnifera) is an adaptogenic herb used in Ayurvedic medicine. Standardized root extracts (KSM-66, Sensoril) have robust clinical evidence for reducing cortisol, improving stress resilience, and modestly increasing testosterone and muscle strength in men. Root powder has more modest but still meaningful effects.
Ashwagandha Dosage by Age Group
| Age Group | Age Range | Dose Range | Notes |
|---|---|---|---|
| Adults — stress / anxiety | 18–64 years | 300–600 mg | Standardized extract (KSM-66 or Sensoril); 2× daily |
| Adults — root powder | 18–64 years | 3000–6000 mg | 3–6 g/day of non-standardized root powder |
| Adults — testosterone / athletic performance | 18–64 years | 300–600 mg | KSM-66 extract; studies used 300–600 mg twice daily |
| Adults — thyroid support | 18–64 years | 300–500 mg | May raise T3/T4; monitor if on thyroid medication |
When and how to take Ashwagandha
Take with food to reduce GI discomfort. Once or twice daily dosing both work. For stress and sleep, taking the daily dose in the evening or splitting AM/PM is common. Effects accumulate over 4–8 weeks of consistent use.
Available Forms
Patented full-spectrum root extract. Most studied. Standardized to ≥5% withanolides.
Most clinical evidence uses 300 mg KSM-66 twice daily
Root and leaf extract. Standardized to ≥10% withanolides. Slightly smaller dose range.
Common dose: 125–250 mg twice daily
Traditional Ayurvedic form. Lower concentration of active compounds.
Requires 3–6 g/day vs. 300–600 mg of standardized extract
Safety Cautions
- Avoid during pregnancy — may cause uterine contractions and miscarriage.
- May increase thyroid hormone levels — caution if on thyroid medication (hyperthyroidism risk).
- Rare cases of liver toxicity have been reported, typically with very high doses — discontinue if you develop jaundice or abdominal pain.
- May have sedative properties — use caution with CNS depressants (benzodiazepines, alcohol).
- Nightshade allergy: ashwagandha is in the nightshade (Solanaceae) family.
Frequently Asked Questions
How much ashwagandha should I take?
For stress and anxiety, use 300–600 mg of a standardized extract (KSM-66 or Sensoril) daily, divided into two doses. Most clinical trials use 300 mg KSM-66 twice daily (600 mg total). Effects on stress, sleep, and mood typically appear after 4–8 weeks of consistent use.
What is the difference between KSM-66 and regular ashwagandha?
KSM-66 is a proprietary ashwagandha root extract standardized to ≥5% withanolides (the active compounds). Regular root powder has variable and typically lower withanolide content. KSM-66 has more clinical trials supporting specific dosing. You need 3–6× more root powder to achieve equivalent effects.
Can ashwagandha be taken long-term?
Most clinical studies have run 8–16 weeks. Safety at longer durations (6+ months) is not as well characterized. Cycling (e.g., 8 weeks on, 2–4 weeks off) is a common precaution. Monitor liver enzymes with long-term use at higher doses.
Sources & References
- Chandrasekhar K et al., Indian J Psychol Med 2012 — KSM-66 safety and efficacy
- Langade D et al., Cureus 2019 — Ashwagandha and sleep quality
- Wankhede S et al., JISSN 2015 — Ashwagandha and muscle strength