KSM-66 Ashwagandha
Also known as: Withania somnifera, Ashwagandha root extract, Indian ginseng, Winter cherry
Effective Dosage
300-600 mg daily (root extract); based on general clinical use
What the Science Says
KSM-66 is a branded, standardized extract of ashwagandha root (Withania somnifera), an herb used in Ayurvedic medicine for centuries. It is classified as an adaptogen — a substance thought to help the body manage stress. Human trials on ashwagandha (not all using KSM-66 specifically) suggest it may reduce perceived stress, lower cortisol levels, and improve sleep quality with consistent use over 8–12 weeks. The provided research only covers a 90-day animal safety study, which found no adverse effects at high doses, and a partial abstract on neuroprotective effects — so clinical benefit claims here draw on the broader ashwagandha literature, not the papers supplied.
What It Doesn't Do
Won't replace medical treatment for anxiety or depression. No proven direct muscle-building effect on its own. Not a testosterone booster in any meaningful clinical sense for healthy adults. The 'KSM-66' branding doesn't automatically mean it outperforms other ashwagandha extracts — the evidence base is for ashwagandha generally. Won't produce overnight results.
Evidence-Based Benefits
KSM-66 is a standardized extract of ashwagandha, which is traditionally used for its adaptogenic properties. Limited clinical trials suggest potential benefits for stress reduction and improving cognitive function, but the evidence is not robust enough to draw definitive conclusions.
Weak EvidenceEffective at: 300-600 mg daily
Source: PubMed, NIH DSLD
Absorption & Bioavailability
Unknown from provided studies. General literature suggests fat-soluble withanolides (the active compounds) may absorb better when taken with food containing fat, but no pharmacokinetic data was provided.
Red Flags to Watch For
- Safety data provided is from rats only — human long-term safety data is limited in the supplied research
- KSM-66 is a proprietary brand; some supporting studies are funded by the manufacturer, which can introduce bias
- Ashwagandha has been linked to rare cases of liver injury in post-market reports — consult a doctor if you have liver conditions
- Pregnant or breastfeeding individuals should avoid use; safety in these populations is not established
- May interact with thyroid medications, immunosuppressants, or sedatives — check with a healthcare provider
Products Containing KSM-66 Ashwagandha
See how KSM-66 Ashwagandha is used in these analyzed products:
Research Sources
- General knowledge
- PMID: 37711361 (90-day rat toxicity study)
- PMID: 34765761 (partial neuroprotection abstract)
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06