Ashwagandha
Affiliate link: we may earn a commission at no extra cost to you. Disclosures
Ashwagandha. Adaptogenic herb that down-regulates HPA-axis output — lowers cortisol, supports T in stressed men.
How it works. Withanolides modulate the HPA axis, attenuating cortisol secretion under stress. Likely acts on GABA-A receptors and reduces sympathetic tone.
What the research supports. 5 graded claims. Strongest: Reduces perceived stress and serum cortisol (strong).
How much to take. Typical dose: 600 mg KSM-66 (or 240 mg Shoden). Split AM/PM, or single dose evening for sleep.
Side effects and interactions. 4 medication interactions listed. Serious: Rare reports of acute liver injury — discontinue if jaundice develops.
Stacking. Pairs well with Magnesium glycinate, L-Theanine. Avoid combining with Other strong sedatives.
Forms. 3 forms. Pick one to open its profile.
Key studies. 11 studies cited. The strongest are listed with links to PubMed.
Community. Experiences from people who have tried Ashwagandha. Anecdotes are not medical advice.
Ashwagandha. Adaptogenic herb that down-regulates HPA-axis output — lowers cortisol, supports T in stressed men.
What it is
An evergreen shrub in the nightshade family used for >3,000 years in Ayurveda. Standardized root extracts (KSM-66, Shoden) deliver withanolide-rich doses studied in modern trials.
Also called
Food sources
Goals
How it works
Withanolides modulate the HPA axis, attenuating cortisol secretion under stress. Likely acts on GABA-A receptors and reduces sympathetic tone.
Pathways
- HPA-axis modulation
- GABA-A agonism
- Nrf2 antioxidant pathway
Effects
- ↓Cortisol (~20–30%) decreases
- ↓Perceived stress decreases
- ↑Testosterone in stressed/subfertile men increases
- ↑VO₂ max increases
- +Sleep quality supports
What the research supports
Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.
As an Amazon Associate I earn from qualifying purchases. Look for USP, NSF or Informed Sport seals before you buy.
Side effects & interactions
Common side effects
- Drowsiness (especially at higher doses)
- Mild GI upset
Serious
- Rare reports of acute liver injury — discontinue if jaundice develops
Medication interactions
May potentiate thyroid hormone activity.
Immunomodulatory — may interfere.
Additive CNS depression.
May lower blood sugar additively.
Check any supplement–medication combination with your pharmacist before starting.
Combines with
Pairs well
- Magnesium glycinateSynergistic for sleep and stress.
- L-TheanineComplementary GABAergic calm without sedation.
Avoid combining
- Other strong sedativesAdditive drowsiness.
Key studies
11 studies cited in total.
Opens current human and preclinical literature matching Ashwagandha and "Reduces perceived stress and serum cortisol". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Ashwagandha and "Improves sleep quality". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Ashwagandha and "Increases testosterone in stressed/subfertile men". Filter by RCT, meta-analysis, or year on the results page.
Discussion
Loading discussion…