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Last verified: 46 days ago

KSM-66 Ashwagandha

Also known as: Withania somnifera, Indian ginseng, winter cherry, ashwagandha root extract

Evidence under review. — Not yet rated

Branded ashwagandha root extract. Generally studied for stress, cortisol, sleep, and athletic performance.

  • What it does

    KSM-66 is a patented, full-spectrum ashwagandha root extract standardized to at least 5% withanolides, the plant's active compounds. Ashwagandha is an adaptogenic herb used in Ayurvedic medicine...

  • Evidence quality

    Evidence base hasn't been formally rated yet. See research below.

  • Clinical dose

    300-600 mg daily (based on general clinical knowledge, not provided studies)

  • Found in

    WeightWorld Ashwagandha KSM-66 Tablets, Calm My Brain, BrainMD Stress Relief Sleep and 4 more

See full breakdown ↓ Methodology →

What the Science Says

KSM-66 is a patented, full-spectrum ashwagandha root extract standardized to at least 5% withanolides, the plant's active compounds. Ashwagandha is an adaptogenic herb used in Ayurvedic medicine for centuries to help the body manage stress. Clinical research on ashwagandha broadly suggests it may reduce perceived stress and cortisol levels, improve sleep quality, and modestly support testosterone and physical performance in healthy adults — though no specific studies were provided to confirm these effects for this exact product.

What It Doesn't Do

Won't eliminate anxiety or replace medical treatment for stress disorders. Not a proven testosterone booster in the way anabolic compounds are. Won't build muscle on its own without training. The 'KSM-66' branding doesn't automatically mean it outperforms other quality ashwagandha extracts. Effects are not immediate — most research suggests 4-8 weeks of consistent use.

Evidence-Based Benefits

May reduce stress and anxiety

Moderate Evidence

Source: auto-research

Absorption & Bioavailability

Moderate — fat-soluble withanolides absorb better when taken with food containing fat. The full-spectrum root extract format of KSM-66 is designed to preserve the natural ratio of active compounds, which may support absorption compared to isolated extracts.

Red Flags to Watch For

  • No study abstracts were provided — all claims here rely on general knowledge, not verified research data
  • KSM-66 is a proprietary branded ingredient; much of its supporting research is industry-funded, which can introduce bias
  • Ashwagandha has been linked to rare cases of liver injury — consult a doctor if you have liver conditions
  • May interact with thyroid medications, sedatives, or immunosuppressants — check with a healthcare provider
  • Products labeled 'KSM-66' may vary in actual withanolide content depending on manufacturer quality control

Products Containing KSM-66 Ashwagandha

See how KSM-66 Ashwagandha is used in these analyzed products:

WeightWorld Ashwagandha KSM-66 Tablets

Supplement

Mostly Legit

Calm My Brain

Supplement

Mostly Legit

BrainMD Stress Relief Sleep

Supplement

Mostly Legit

Lemme Chill Ashwagandha Gummies

Supplement

Overhyped

Eversmithorganics

Supplement

Overhyped

BPI Sports Best Test 120 Tablets

Supplement

Misleading

TestoPrime

Supplement

Misleading
View all product reviews →

Research Sources

  • General knowledge

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