Does Ashwagandha Raise Testosterone? A clinical evidence deep dive
Last updated: July 4, 2026
"Does ashwagandha raise testosterone?" is one of the most-asked questions in men's health. This article walks through the most cited clinical trials — Lopresti 2019, Wankhede 2015, Chandrasekhar 2012 — and explains the mechanisms, the realistic upside, and the caveats.
Table of contents
1. Mechanism — how ashwagandha is thought to act
Ashwagandha is not a drug that pushes testosterone up directly. It is studied as an adaptogen — a plant that may support the broader environment around testosterone production: the stress response, cortisol, sleep, recovery, and oxidative stress.
The most documented pathway is via cortisol. Chronically elevated cortisol has been shown in research to compete with testosterone synthesis. Several ashwagandha trials report changes in cortisol-related markers, which could indirectly support a healthier testosterone environment.
In addition, male-focused trials report direct changes in hormone-related markers — DHEA-S and testosterone-related indices — suggesting more than one mechanism is at play.
- Cortisol regulation → indirect support for testosterone-producing environment
- HPA-axis (stress-response) modulation
- Sleep-quality support → protects the time when testosterone secretion peaks
- Reduced oxidative stress (a known protective factor for testicular function)
- Direct changes in hormone-related markers in some male-focused trials
For more on the cortisol-testosterone relationship, see the cortisol complete guide.
3. Why KSM-66 specifically?
KSM-66 is the standardized ashwagandha extract developed by Ixoreal Biomed and used in all three of the trials covered here — Lopresti 2019, Wankhede 2015, and Chandrasekhar 2012 — as well as in much of the broader research base.
Three things distinguish KSM-66. First, it is extracted from the root only — closer to traditional Ayurvedic use, without leaves or stems. Second, it is standardized to ≥5% withanolides, so the active-compound load is consistent batch to batch. Third, it uses a proprietary "full-spectrum" extraction process without harsh chemical solvents, preserving the natural balance of compounds.
Many "ashwagandha extract" products on the market are not standardized, may include leaf material, or do not disclose withanolide content. If you want results closer to the published research, choose the form actually used in that research.
4. Dose and duration
The dosing across the three studies above is remarkably consistent: 300 mg twice daily of KSM-66 (600 mg/day total).
Doses used in the studies
- Chandrasekhar 2012: KSM-66, 300 mg x 2/day (600 mg/day), 60 days
- Wankhede 2015: KSM-66, 300 mg x 2/day (600 mg/day), 8 weeks
- Lopresti 2019: KSM-66, 300 mg x 2/day (600 mg/day), 8 weeks
Practical starting point
Newcomers can start at 300 mg once daily for 1–2 weeks and, if well tolerated, move to 300 mg twice daily. Plan to give it at least the 8–12 weeks used in trials before evaluating.
For more on dose, timing, and forms, see our ashwagandha dosage guide.
For dose and timing detail, see the ashwagandha dosage guide.
5. Stacking with other testosterone support
Ashwagandha often pairs sensibly with foundational nutrients that, when missing, weaken everything you do on top.
- Zinc — essential for testicular function and testosterone synthesis (10–25 mg/day)
- Vitamin D — supplement to correct documented deficiency (1000–2000 IU/day)
- Magnesium — sleep, nerve transmission, muscle function (200–400 mg/day)
- Omega-3 — anti-inflammatory, cardiovascular and brain support (EPA+DHA 1000 mg/day)
Adaptogen on adaptogen?
Combinations with rhodiola, tongkat ali, or maca exist in tradition but most research evaluates single ingredients. Try one adaptogen at a time, for 4 to 8 weeks, before stacking.
6. Cautions and side effects
Healthy adults using recommended amounts generally tolerate KSM-66 well in published trials. That said, watch for the following.
Reported (mostly mild) side effects
- GI upset (nausea, loose stools)
- Drowsiness
- Headache
- Rare hepatic concerns (case-report level)
Avoid or seek clinician guidance if
- Pregnant or breastfeeding (safety not established)
- Thyroid disease (potential effect on thyroid hormone levels)
- Autoimmune disease (potential immune effects)
- Taking sedatives, thyroid medication, immunosuppressants, anticoagulants
- Within 2 weeks of surgery
- Liver disease or history of liver issues
Read more
See our ashwagandha side-effects guide for a full breakdown. If you take medication, please consult a clinician or pharmacist before starting.
For full safety details, see the ashwagandha side-effects guide.
2. Key clinical trials
These are the three trials cited most often when people ask whether ashwagandha affects testosterone. Reading them in their actual scope makes the answer much clearer.
Lopresti AL et al., 2019
PubMed: 30854916- Population
- Overweight middle-aged men (40–70) with mild fatigue. Placebo-controlled, double-blind, randomized.
- Intervention
- KSM-66 ashwagandha root extract 300 mg twice daily (600 mg/day) vs placebo
- Duration
- 8 weeks
- Findings
- Reported changes vs placebo in DHEA-S and testosterone-related markers, alongside fatigue and quality-of-life measures.
- Takeaway
- One of the few ashwagandha trials directly relevant to the older male population (the "LOH age range"). Frequently cited as evidence for testosterone-environment support.
Wankhede S et al., 2015
PubMed: 26609282- Population
- Healthy young men (18–50) new to resistance training. Placebo-controlled, double-blind, randomized.
- Intervention
- KSM-66 ashwagandha root extract 300 mg twice daily (600 mg/day) plus resistance training vs placebo plus resistance training
- Duration
- 8 weeks
- Findings
- Reported changes vs placebo in strength and lean mass markers, serum testosterone, and post-training muscle-damage indices.
- Takeaway
- The most-cited testosterone-relevant trial for the "trains and lifts" demographic. Particularly useful because the intervention is paired with actual training.
Chandrasekhar K et al., 2012
PubMed: 23439798- Population
- Adults reporting chronic stress (18–54, mixed-sex). Placebo-controlled, double-blind, randomized.
- Intervention
- KSM-66 ashwagandha root extract 300 mg twice daily (600 mg/day) vs placebo
- Duration
- 60 days
- Findings
- Reported changes vs placebo in stress measures (PSS) and serum cortisol.
- Takeaway
- Not a direct testosterone study, but cortisol reduction supports the testosterone environment indirectly. Important context for any "male hormone" discussion.
7. Frequently asked questions
Will ashwagandha definitely raise my testosterone?
No. The trials above describe average results in specific populations under specific conditions. Supplements are not medicines and individual responses vary.
How fast should I expect changes?
The studies above ran 8 weeks to 60 days. Plan at least 4 weeks of consistent use, alongside lifestyle work, before evaluating.
Is KSM-66 the same as any other ashwagandha?
No. Generic "ashwagandha extract" varies widely in composition and potency. The studies cited here all used KSM-66, a root-only standardized extract — choose that form if you want results close to the research.
Do healthy young men get any benefit?
Wankhede 2015 specifically studied younger men in resistance training and reported changes in strength, lean mass, and serum testosterone. For asymptomatic men, however, the basics — sleep, training, nutrition — outperform any supplement.
Can ashwagandha alone normalize low testosterone?
If you have meaningful symptoms or possible late-onset hypogonadism, a clinician evaluation comes first. Supplements are an adjunct, not a substitute for medical care.
Can I combine ashwagandha with TRT?
If you are on testosterone replacement therapy, do not start additional supplements without speaking to your prescriber. Interaction data are limited.
Does lower cortisol mean higher testosterone?
Chronically high cortisol is a known stressor on testosterone synthesis. Bringing cortisol back into a healthy rhythm makes the environment for testosterone production friendlier — which is closer to the truth than "cortisol down means testosterone up" as a one-to-one effect.
I take medication. Can I use ashwagandha?
Possible interactions exist with thyroid, immunosuppressant, sedative, anticoagulant, and diabetes medications. Speak with a clinician or pharmacist before starting.
8. Summary: choose the form actually used in research
Ashwagandha is not a testosterone drug; it is an adaptogen that may support the broader testosterone environment — stress, cortisol, sleep, recovery — at studied doses. Lopresti 2019, Wankhede 2015, and Chandrasekhar 2012 all used KSM-66, the standardized extract Livaya offers in our premium ashwagandha. Use it as a complement to a strong daily routine.
Explore Livaya Ashwagandha KSM-66