Ashwagandha for Men: Testosterone, Fertility and What It Won't Do
Ashwagandha does raise testosterone in men, and the increase is smaller than the marketing implies. A 2026 meta-analysis of 23 randomized controlled trials covering 1,706 people found a mean testosterone increase of 57.43 ng/dl in men, with no significant effect in women (Fornalik et al., 2026, Planta Medica). For a man sitting mid-range at 500 ng/dl, that is roughly an 11% shift. Real, measurable, and not a replacement for anything a doctor would prescribe.
TL;DR:
Testosterone: up about 57 ng/dl in men across 23 trials. Meaningful but modest, and larger in men who start stressed or fatigued.
Fertility: the strongest male result. In oligospermic men, 675 mg a day for 90 days raised sperm count 167%, semen volume 53%, and motility 57%.
Stress: cortisol drops substantially, and this is probably how most of the other effects happen.
Dose: 300 mg of standardized root extract twice daily, or 600 mg once, for at least 8 weeks.
Main caveat: it raises thyroid hormone slightly, interacts with sedatives and immunosuppressants, and rare liver injury has been reported.
Please note: This article is for informational purposes only and is not medical advice. Ashwagandha can affect thyroid hormone, blood sugar, and blood pressure, and interacts with sedatives, thyroid medication, and immunosuppressants. If you have a thyroid condition, an autoimmune disease, liver disease, or a hormone-sensitive prostate condition, consult a healthcare professional before starting it.
What Ashwagandha Does in a Male Body
Ashwagandha is Withania somnifera , a herb used in Ayurveda for over 3,000 years as a Rasayana, a rejuvenating tonic. The active compounds are withanolides, steroidal lactones concentrated in the root. Standardized extracts are labelled by withanolide percentage, the number that matters when products are compared.
The primary mechanism is stress-axis modulation. Ashwagandha dampens hypothalamic-pituitary-adrenal activity and lowers cortisol, with the same 23-trial meta-analysis showing a standardized mean difference of -1.18 for cortisol and a rise in serotonin (Fornalik et al., 2026). Cortisol and testosterone are inversely related, so lowering chronic cortisol tends to let testosterone recover. This matters because it predicts who responds: a chronically stressed 45-year-old has more room to move than a well-rested 25-year-old athlete.
Does Ashwagandha Boost Testosterone?
Yes, in men, with a clear sex difference. The 2026 meta-analysis found testosterone levels increased 57.43 ng/dl in men compared with 5.09 ng/dl in women, a statistically significant gender difference, and subgroup analysis suggested a dose-response relationship tied to withanolide content (Fornalik et al., 2026).
Individual trials show the range. In a 16-week crossover study of overweight men aged 40 to 70 with mild fatigue, an extract delivering 21 mg of withanolide glycosides daily produced a 14.7% higher rise in testosterone levels and an 18% higher rise in DHEA-S compared with placebo, with no significant change in cortisol or estradiol (Lopresti et al., 2019, American Journal of Men's Health). In 50 adults with low sexual desire, 300 mg of root extract twice daily for eight weeks increased serum testosterone significantly compared with placebo, with prolactin unchanged (Chauhan et al., 2022, Health Science Reports).
What ashwagandha does not do is turn low testosterone levels into normal ones. If yours are clinically low, that needs investigation and possibly prescription treatment. An 11% shift is a nudge, not a correction. Nor does it increase testosterone production in men whose levels are already healthy and unstressed.
Fertility and Semen Quality: The Strongest Evidence
A randomized pilot study enrolled 46 adults with oligospermia, meaning a sperm count under 20 million per millilitre. The treatment group took 675 mg a day of full-spectrum root extract in three doses for 90 days. Sperm count increased 167%, semen volume 53%, and motility 57% from baseline, with minimal change in the placebo group compared with treatment and better hormone regulation in the treated men (Ambiye et al., 2013, Evidence-Based Complementary and Alternative Medicine).
A systematic review confirmed the same direction: sperm concentration up 167%, semen volume up 59%, motility up 57%, serum testosterone up 17%, and luteinizing hormone up 34% after 90 days, with no adverse effects. Its authors noted only one randomized controlled trial existed at the time, so the evidence is promising rather than settled (Durg et al., 2017, Phytomedicine).
Recent double-blind placebo-controlled work in healthy adults points the same way. In 76 healthy males aged 30 to 50 taking 300 mg twice daily for eight weeks, ejaculate volume increased 36%, total sperm count 38%, and total motility 87% compared with placebo, with higher sexual desire and International Index of Erectile Function scores (Khanna et al., 2026, Frontiers in Reproductive Health). A separate double-blind placebo-controlled trial in 100 men at the same dose found improvements in semen volume, sperm number, concentration, and morphology, plus orgasmic function, with no changes in liver or kidney parameters (Mutha et al., 2025, Journal of Ayurveda and Integrative Medicine).
One caveat: some animal studies report reversible spermicidal effects, with outcomes depending on extract preparation and dose (Azgomi et al., 2018, BioMed Research International). The human data run the other way, but it is a reason to stick to studied doses of standardized root extract.
Stress and Anxiety: Why Men Actually Notice It
Most men taking this herb report feeling calmer and sleeping better before they notice anything hormonal, and that ordering makes sense given the mechanism. Reducing stress hormones is the largest and most consistent finding in the whole literature, and the increased serotonin of 31.75 ng/ml in the meta-analysis points the same way (Fornalik et al., 2026).
Ashwagandha is best studied in adults for stress and anxiety symptoms rather than for hormones. Randomized double-blind placebo-controlled trials in stressed adults consistently show lower perceived stress scores compared with placebo, and the mental health case is stronger than the testosterone case even though testosterone is what sells the product. If reducing stress and anxiety is your goal, this herb is a reasonable first choice; if raising testosterone levels is the only goal, expect a modest effect.
The subjective effect is not universal. The 16-week crossover trial in aging overweight adults found hormonal changes without statistically significant between-group differences in fatigue, vigor, or sexual well-being compared with placebo (Lopresti et al., 2019). Blood markers moved; how men felt did not clearly separate. Both things can be true.
Dosage, Timing, and Cycling
The trials cluster around 600 mg a day of standardized root extract, usually split as 300 mg twice daily; the fertility studies used 675 mg in three doses. An extract standardized to 5% withanolides delivers roughly 30 mg of withanolides at 600 mg, the range used in the hormone trials.
Root extract, not leaf. The clinical evidence is almost entirely on root preparations, and leaf extracts have a different withanolide profile with less human data. Named extracts such as KSM-66 and Sensoril carry most of the trial evidence, which is why they cost more.
Give it eight weeks, or 90 days for fertility, since that is roughly one full cycle of sperm production. Take it with food, and weight the second dose to the evening if sleep is part of what you want.
Do you need to cycle off ashwagandha? There is no trial answer. Most human studies ran eight to twelve weeks, so daily use beyond about three months is not well characterized rather than known to be harmful. A common practical approach is three months on, two to four weeks off, then reassess whether it is still doing anything. For a stack aimed at strength and recovery, our muscle and performance range covers the other pieces.
Side Effects, Interactions, and Who Should Skip It
Across the male trials cited here, researchers reported no adverse events and no significant changes in liver or kidney blood work (Mutha et al., 2025). Ashwagandha is well tolerated at studied doses. The realistic issues are these.
- Digestive upset and drowsiness. The most common complaints, usually mild and often solved by taking it with food.
- Thyroid. The meta-analysis found no effect on TSH or T3 but a modest rise in T4 of 0.61 µg/dL (Fornalik et al., 2026). If you have hyperthyroidism or take levothyroxine, involve your prescriber.
- Autoimmune disease. Ashwagandha stimulates parts of the immune response, so people with lupus, rheumatoid arthritis, or Hashimoto's should get medical advice first.
- Sedatives and alcohol. Additive drowsiness with benzodiazepines, sleep medication, and alcohol.
- SSRIs. Given the serotonin finding, combining ashwagandha with an SSRI is worth discussing with your prescriber rather than doing quietly.
- Liver injury. Rare cases of drug-induced liver injury have been reported to national registries. Stop and get medical advice if you develop jaundice, dark urine, or unexplained abdominal pain.
- Surgery. Stop two weeks beforehand because of the sedative and blood sugar effects.
Ashwagandha is not FDA-approved because dietary supplements are not approved as drugs in the US. The FDA regulates them for safety and labelling, not efficacy. That is a regulatory fact, not a verdict on the ingredient. Our organic ashwagandha with black pepper and the ashwagandha and maca combination take different approaches to the same root.