Does Ashwagandha Raise Testosterone? Here's What Studies Show

How does Ashwagandha actually support testosterone signaling?

Ashwagandha (Withania somnifera) is an adaptogen, a class of herbs that help the body manage stress without sedating it. Its active compounds are withanolides, particularly withaferin A and withanolide D. The mechanism is indirect but powerful:

• Cortisol reduction. Withanolides modulate the hypothalamic-pituitary-adrenal (HPA) axis, lowering cortisol output by 14-28% in stressed adults.
• Cortisol suppression of testosterone is reversed. Cortisol and testosterone share precursor pathways. When cortisol demand drops, more pregnenolone is available for testosterone synthesis.
• DHEA-S support. Studies show parallel increases in DHEA-S, the adrenal precursor to testosterone.
• Sleep quality improvement. Better deep sleep means better overnight testosterone production. Most testosterone is made between 11pm and 4am.

So Ashwagandha doesn't push testosterone up directly, it removes the brake. For most men over 30 with elevated cortisol, that brake is the bottleneck.

What do the clinical studies actually show?

Three studies are the backbone of the testosterone evidence:

Lopresti et al., 2019 (American Journal of Men's Health): 600 mg/day of KSM-66 Ashwagandha for 8 weeks in overweight men aged 40-70. Results: testosterone +14.7%, DHEA-S +18%, fatigue and stress scores significantly improved.

Wankhede et al., 2015 (Journal of the International Society of Sports Nutrition): 300 mg of KSM-66 twice daily for 8 weeks in men engaged in resistance training. Results: testosterone +18.1%, muscle strength gains nearly double the placebo group, body fat percentage decreased.

Salve et al., 2019 (Cureus): 240 mg/day of full-spectrum Ashwagandha for 60 days in stressed adults. Cortisol dropped 28%, anxiety scores dropped significantly. Testosterone wasn't the primary endpoint, but the cortisol reduction is the upstream mechanism for the testosterone effect.

Effect sizes are smaller than what TRT produces (a 14-18% lift vs the 200-400% lift TRT can give), but Ashwagandha is also non-suppressive of natural production. Your testes don't shut down. There's no exit ramp problem.

How much Ashwagandha should men take?

The clinical literature converges on these numbers:

• Standard daily dose: 300-600 mg of KSM-66 standardized to 5% withanolides, OR 250-500 mg of Sensoril standardized to 10% withanolides.
• Best timing: With breakfast and dinner (split dose) OR a single dose with breakfast. Sensoril is sometimes taken at night for sleep benefits.
• With food. Withanolides are fat-soluble and absorption improves significantly with a fat-containing meal.
• Cycle considerations: Most studies are 8-12 weeks. Some long-term users cycle 12 weeks on / 4 weeks off; others run continuous. No suppression mechanism has been documented.

Brookhaven's Total Men's Package uses 300 mg of KSM-66-grade Ashwagandha standardized to 5% withanolides, the dose used in the Wankhede strength-training study, paired with the synergistic ingredients (Tongkat Ali, Shilajit, organ meats, vitamins, minerals) that testosterone synthesis depends on.

How long does it take to feel Ashwagandha working?

Effects appear in three waves:

• Week 1-2: Sleep quality and stress tolerance often improve first. Most users notice an easier time falling asleep and feeling more "resourced" under pressure.
• Week 3-6: Cortisol drops compound. Energy is steadier through the day. Anxiety symptoms (if present) reduce. Workout recovery improves.
• Week 7-12: Testosterone changes show on blood work. Strength and body composition shifts become measurable.

If you're tracking objectively, get a baseline blood panel (total testosterone, free testosterone, SHBG, DHEA-S, cortisol AM) before starting and re-test at 8-12 weeks.

Who should consider Ashwagandha?

The strongest candidates:

• Men 30+ noticing stalled recovery, low energy, or stress-driven mood patterns
• Men with chronically high cortisol (poor sleep, abdominal weight gain, "tired but wired" feeling)
• Athletes and active men who want strength gains without the systemic load of harsher compounds
• Men with sub-clinical anxiety who want a non-pharmaceutical first-line approach

Less ideal: men with autoimmune conditions (Ashwagandha can stimulate immune activity), men on thyroid medication (it modulates thyroid hormone, your dose may need adjusting), pregnant women, and anyone on sedatives or blood pressure medication without physician oversight.

Common Questions

Does Ashwagandha actually support testosterone signaling or just feel like it does?

Both. Subjectively users report better mood, energy, and stress tolerance within 1-2 weeks. Objectively, three peer-reviewed RCTs show testosterone increases of 14-18% on blood work at 8 weeks at clinical doses. The mood effects are not the testosterone effect, those come from cortisol reduction. The hormonal effects show up later on lab work.

What's the best form of Ashwagandha to buy?

The two clinically-validated standardized extracts are KSM-66 (5% withanolides, full-spectrum, made by Ixoreal Biomed) and Sensoril (10% withanolides, water-extracted, made by Natreon). KSM-66 has the most testosterone and strength data. Sensoril is more sedating and is often used as a sleep aid. Avoid generic "Ashwagandha root powder" without standardization, the withanolide content can vary 10x batch to batch.

Should I take Ashwagandha in the morning or at night?

KSM-66 is typically taken in the morning or split between morning and evening with food. It's not sedating and won't put you to sleep. Sensoril is more often taken at night because of its higher withanolide concentration and sleep-promoting profile. With Total Men's Package (KSM-66-grade), morning with breakfast is ideal, pairs with the natural cortisol awakening response.

How does Ashwagandha compare to Tongkat Ali for testosterone?

Different mechanisms, complementary effects. Tongkat Ali lowers SHBG to free up testosterone the body has already made (a "bioavailability" play). Ashwagandha lowers cortisol to allow the body to make more testosterone in the first place (a "production" play). Stacked together, you address both axes, which is why Total Men's Package contains both, plus Shilajit for the mitochondrial energy required for testosterone synthesis.

Can women take Ashwagandha?

Yes, with one caveat. The cortisol-reducing, sleep-improving, and stress-management benefits apply equally to women. The testosterone effect in women is much smaller and rarely problematic at clinical doses. Pregnant women should avoid it (animal data suggests possible effects on uterine tone). Women with thyroid conditions should consult a physician.

Is Ashwagandha safe to take long-term?

Studies up to 12 months show no adverse effects at clinical doses. There's no documented suppression mechanism, withdrawal, or tolerance. Some long-term users cycle 12 weeks on / 4 weeks off out of caution; others run continuously. Get baseline blood work and recheck annually if you take any supplement long-term.

Can I take Ashwagandha with caffeine, creatine, or other supplements?

Yes, no documented interactions with caffeine, creatine, vitamin D, or most other common supplements. Be more careful with sedatives, thyroid medication, blood pressure medication, and immunosuppressants. Ashwagandha can amplify the effects of GABAergic compounds (alcohol, benzodiazepines, certain sleep aids).

Will Ashwagandha shut down my natural testosterone production?

No. Unlike anabolic steroids or TRT, Ashwagandha works through the upstream stress axis, not by replacing testosterone directly. There's no negative feedback loop to your testes. This makes it a sustainable long-term option, you can stop taking it without a crash.

The Bottom Line

Ashwagandha supports testosterone signaling in men by 14-18% at clinical doses (300-600 mg/day of KSM-66) over 8 weeks, working primarily through cortisol reduction and HPA axis modulation. The strongest candidates are men 30+ under chronic stress, with stalled recovery, or with elevated cortisol patterns. Use a standardized extract (KSM-66 or Sensoril), take it with food, and get blood work at baseline and 8-12 weeks to track results.

Brookhaven's Total Men's Package includes 300 mg of KSM-66-grade Ashwagandha alongside Tongkat Ali, Shilajit, organ-meat concentrates, and the vitamin and mineral cofactors testosterone synthesis depends on. Read the full formula and mechanism on the Science page, or read more on the Tongkat Ali + Shilajit synergy.

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult a licensed physician before starting any new supplement, particularly if you take prescription medication, have a thyroid condition, or have a diagnosed medical condition.