Ashwagandha KSM-66
The most clinically studied adaptogen on the market. KSM-66 is the specific extract with the strongest evidence for cortisol reduction, stress resilience and sleep improvement.
What is Ashwagandha KSM-66?
Ashwagandha (Withania somnifera) is an adaptogen — a plant that helps the body adapt to and resist stress. KSM-66 is a specific patented root extract developed in India, standardized to contain at least 5% withanolides — the active compounds responsible for its effects.
The KSM-66 designation matters. Many ashwagandha products on the market are cheap root powders with minimal active compounds. KSM-66 has over 24 clinical studies specifically on this extract, making it the most evidence-backed form available.
What the Research Shows
- Reduces serum cortisol by 15–25% in multiple randomized controlled trials
- Significantly improves self-reported stress and anxiety scores
- Improves sleep onset and quality — reduces time to fall asleep
- Modest but consistent increase in testosterone in men (8–15%)
- Improves VO2 max and endurance performance in athletes
- Reduces C-reactive protein — a marker of systemic inflammation
- Improves memory and cognitive function in clinical trials
Is Ashwagandha Right for You?
- Have high stress levels or feel chronically overwhelmed
- Struggle with sleep despite being tired
- Want to support testosterone naturally
- Are an athlete wanting to improve recovery and endurance
- Experience anxiety without wanting pharmaceutical intervention
- Are pregnant or breastfeeding — ashwagandha is contraindicated
- Have thyroid conditions — it can affect thyroid hormone levels
- Take immunosuppressant medications
- Have autoimmune conditions — it stimulates immune function
How to Take Ashwagandha
Always check the label says KSM-66 or Sensoril specifically. Generic "ashwagandha root powder" products may contain very little active withanolide content despite the same headline dose.
Why KSM-66 Specifically?
KSM-66 — Full-spectrum root extract, 5%+ withanolides, 24+ clinical studies, best evidence for stress, cortisol, and testosterone. The gold standard.
Sensoril — Root and leaf extract, higher withanolide content (10%), some studies showing good efficacy, typically better for sleep specifically.
Generic ashwagandha powder — Variable withanolide content, minimal clinical research on specific products. Much cheaper but results are inconsistent.
For most people, KSM-66 at 300–600mg is the right choice. If sleep is your primary goal, Sensoril is a reasonable alternative.
Safety & Side Effects
Ashwagandha is well-tolerated at standard doses in most healthy adults. Reported side effects are generally mild:
- Mild digestive upset when taken on an empty stomach — always take with food
- Drowsiness at high doses — if this occurs, reduce to 300mg or take at night
- Rare reports of liver issues at very high doses — stick to recommended amounts
Ashwagandha can increase T3 and T4 thyroid hormones. If you have hypothyroidism or hyperthyroidism, or take thyroid medication, consult your doctor before using.