Ashwagandha
An adaptogenic herb clinically proven to reduce cortisol, anxiety, and support hormonal health.
Ashwagandha is an adaptogenic herb used in Ayurvedic medicine for over 3,000 years. Modern clinical research has validated many traditional uses, with multiple randomized controlled trials demonstrating significant effects on cortisol reduction, anxiety, testosterone, thyroid function, and exercise performance. It is classified as an adaptogen — a substance that helps the body resist and adapt to stress.
Evidence-Based Benefits
Cortisol Reduction
Multiple clinical trials show 15-30% reduction in serum cortisol levels. The most robust data is with KSM-66 extract at 600mg/day.
Anxiety Relief
Meta-analyses confirm significant anxiolytic effects. One trial showed 69% reduction in anxiety and insomnia symptoms vs. 11% for placebo.
Testosterone Support
Clinical trials in men show 10-22% increases in testosterone with 600mg KSM-66 for 8 weeks, likely mediated through cortisol reduction and improved sleep.
Exercise Performance
Research shows improved VO2 max, strength gains, and recovery in both trained and untrained individuals.
Thyroid Support
Studies in subclinical hypothyroid patients show improvements in TSH and T4 levels after 8 weeks of supplementation.
Sleep Quality
The Latin name "somnifera" means "sleep-inducing." Clinical trials confirm improved sleep quality, particularly in anxious individuals.
Dosing Guide
Use standardized extracts (KSM-66 or Sensoril) for consistency. KSM-66 (full-spectrum root extract) is the most studied at 600mg/day. Sensoril (root + leaf extract) is effective at 125-250mg. Effects build over 4-8 weeks.
Forms & Comparison
KSM-66
Full-spectrum root extract standardized to 5% withanolides. Most clinical evidence. Gold standard form.
Sensoril
Root and leaf extract standardized to 10% withanolides. Effective at lower doses (125-250mg). More calming/sedating.
Generic Root Powder
Unstandardized. Inconsistent potency. Requires higher doses (1-3g). Less predictable results.
Cautions & Interactions
- May cause GI discomfort in some individuals — take with food.
- Avoid during pregnancy and breastfeeding.
- May enhance thyroid hormone levels — use cautiously with thyroid medication (monitor TSH).
- May enhance effects of sedative medications and alcohol.
- Rare reports of liver injury — discontinue if you notice symptoms (jaundice, dark urine, fatigue).
- Nightshade family member — avoid if you have nightshade sensitivity.
Frequently Asked Questions
KSM-66 vs Sensoril — which is better?
KSM-66 has more published clinical trials and is the more versatile option. Sensoril may be slightly more calming/sedating, making it better specifically for sleep and anxiety. Both are effective — KSM-66 at 600mg or Sensoril at 125-250mg.
How long does ashwagandha take to work?
Some anxiety relief may be noticed within 1-2 weeks. Full cortisol reduction, testosterone, and performance benefits typically develop over 4-8 weeks of consistent use. Clinical trials typically run 8-12 weeks.
Can I take ashwagandha every day?
Most clinical trials use daily dosing for 8-12 weeks. Some practitioners recommend cycling (8 weeks on, 2 weeks off) though there is no strong evidence requiring this. If you experience any side effects, discontinue.
This page is for educational purposes only. It is not medical advice. Supplements are not FDA-regulated for efficacy. Consult a healthcare provider before starting any supplement, especially if you take medications.