Ashwagandha
Evidence summary
Ashwagandha has moderate evidence in this guide. The reference dose is 300-600mg daily (KSM-66 extract), with timing listed as morning or evening. Supplements should support a sound diet and training plan, not replace them.
- May reduce cortisol and stress
- Could improve recovery
Benefits
- ✓ May reduce cortisol and stress
- ✓ Could improve recovery
- ✓ Some evidence for strength gains
- ✓ May improve sleep quality
Possible Side Effects
- ⚠ May cause drowsiness
- ⚠ Not recommended during pregnancy
- ⚠ Can interact with thyroid medications
- ⚠ Long-term safety data limited
What Is Ashwagandha?
Ashwagandha (Withania somnifera) is an adaptogenic herb used in Ayurvedic medicine for thousands of years. In the fitness world, it has gained popularity for its potential to reduce stress hormones, improve recovery, and even support modest strength gains. The most researched form is the KSM-66 root extract.
How It Works
Ashwagandha is classified as an adaptogen — a substance that helps the body manage stress. It appears to modulate the hypothalamic-pituitary-adrenal (HPA) axis, reducing cortisol output. Since chronically elevated cortisol can impair recovery, muscle growth, and sleep, lowering it could have knock-on benefits for training outcomes.
What the Research Says
Several randomised controlled trials show that ashwagandha supplementation (300-600mg KSM-66 daily) can significantly reduce cortisol levels and self-reported stress. Some studies have also found improvements in VO2 max, strength, and body composition — though the effect sizes are modest and more research is needed. Sleep quality improvements have been noted in multiple trials, which could indirectly benefit recovery.
The evidence is promising but not conclusive. It is not in the same league as creatine or protein for direct performance benefits, but it may help if stress or poor sleep are holding back your training.
Who Should Take It
People dealing with high stress, poor sleep, or elevated cortisol who want a natural support alongside good lifestyle habits. It is not a magic pill — if you are sleeping 5 hours a night and running on caffeine, fixing those basics will do far more than any supplement.
Who Should Avoid It
Pregnant or breastfeeding women should avoid ashwagandha. If you take thyroid medication, consult your doctor first — ashwagandha may alter thyroid hormone levels. Some people report drowsiness, so evening dosing may be preferable if this affects you.
Long-Term Use
Most studies run for 8-12 weeks. There is limited data on long-term use beyond this, so cycling (8 weeks on, 2-4 weeks off) is a reasonable precaution until more data is available.
Vegan?
Ashwagandha is vegan-friendly — it is a plant root extract. Check the capsule material if buying capsules; look for ones using plant-based (HPMC) shells rather than gelatin.
Where to Buy
- Bulk KSM-66 Ashwagandha — from £9.99
- Amazon — Nutravita Ashwagandha KSM-66 — from £12.99
- Myprotein Ashwagandha Capsules — from £10.99
Ashwagandha: common questions
What is ashwagandha used for?
Ashwagandha is commonly considered for may reduce cortisol and stress, could improve recovery, some evidence for strength gains, may improve sleep quality. The evidence rating in this guide is moderate.
When should I take ashwagandha?
The practical timing used in this guide is morning or evening. Consistency and the total daily dose are often more important than a narrow timing window.
How much ashwagandha should I take?
The reference dosage in this guide is 300-600mg daily (KSM-66 extract). Individual needs vary, so check the product label and speak to a qualified healthcare professional if you have a medical condition, take medication, are pregnant, or are unsure.
Is ashwagandha vegan friendly?
This form of ashwagandha can be vegan friendly, but check the capsule, flavouring, and manufacturing details on the specific product.
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