You’ve seen the reels. Some jacked guy holding a bottle of ashwagandha capsules, telling you it’s “nature’s Viagra” and that your ancestors had it figured out all along. Your WhatsApp uncle has been forwarding articles about it. Maybe you’ve already bought a bottle from Amazon and you’re wondering if it’s actually doing anything.

Ashwagandha (Withania somnifera) is one of the most important herbs in Ayurveda, used for thousands of years as a rasayana — a rejuvenator. It’s classified as an adaptogen, meaning it’s supposed to help your body handle stress better. And in the last decade or so, modern science has started looking at it seriously.

So let’s talk about what the research says about ashwagandha and sexual health.

What ashwagandha is

Ashwagandha is a small shrub that grows in India, the Middle East, and parts of Africa. The root is the part used medicinally. The name literally means “smell of horse” in Sanskrit — partly because of the root’s smell, and partly because it was believed to give you the strength and vitality of a horse.

In Ayurveda, it’s one of the most versatile herbs, prescribed for everything from anxiety to arthritis to sexual weakness. Modern researchers have identified several active compounds, the most important being withanolides — a group of naturally occurring steroids.

When you see supplements today, the most studied and standardized extract is KSM-66, a full-spectrum ashwagandha root extract standardized to contain at least 5% withanolides. But it isn’t the only one — other standardized extracts like Shoden and Sensoril have their own trials, and several of the fertility studies used raw root powder rather than any branded extract. The extract type and dose vary across trials, so the results aren’t interchangeable. This matters because “ashwagandha” on a random bottle could mean almost anything — the concentration and quality vary wildly.

The stress and cortisol connection

Before we get to the sexual health claims, we need to talk about stress. Because this is where ashwagandha has its strongest evidence, and it’s directly relevant to why it might help some men sexually.

A well-designed study by Chandrasekhar et al. (2012) found a 27.9% reduction in serum cortisol in 64 adults with a history of chronic stress, using 300mg of a high-concentration root extract twice daily for 60 days [2]. The ashwagandha group also reported significantly lower stress and anxiety scores than placebo.

A separate 2019 randomized, double-blind, placebo-controlled study by Langade et al. looked at 60 adults with insomnia and anxiety taking 300mg of ashwagandha root extract twice daily for 8 weeks. It wasn’t a cortisol study — but the ashwagandha group showed shorter sleep-onset latency, better sleep efficiency, improved scores on the Pittsburgh Sleep Quality Index, and lower anxiety on validated questionnaires [1].

Why does this matter for sexual health? Because chronically elevated cortisol suppresses testosterone production. It also kills libido, contributes to erectile problems, and makes it harder to be present during sex. If your sexual issues are partly driven by stress — and in Indian men working 10-hour days, dealing with family pressure, financial anxiety, and performance expectations, stress is almost always part of the picture — then reducing cortisol is genuinely useful.

The testosterone evidence

This is the claim that gets the most attention. Does ashwagandha boost testosterone?

The most cited study is by Lopresti et al. (2019), a 16-week randomized, double-blind, placebo-controlled crossover trial in 57 overweight men aged 40-70 with mild fatigue, using a standardized ashwagandha extract (Shoden, delivering about 21mg of withanolide glycosides per day). Compared to placebo, the ashwagandha group saw a 14.7% greater increase in testosterone and an 18% greater rise in DHEA-S (a testosterone precursor) [3].

Important context: the participants were overweight, middle-aged men reporting fatigue — not young, healthy men. The testosterone increase, while statistically significant, brought levels from the lower end of normal to… still within normal range. If your testosterone is already in a healthy range, this study doesn’t tell us much about what ashwagandha will do for you.

An earlier study by Ahmad et al. (2010) looked at infertile men specifically and found ashwagandha root powder (5g/day for 3 months) increased testosterone levels by 10-22% depending on the type of infertility. But again — these were men with fertility issues, not a general population [4].

The honest takeaway: Ashwagandha appears to modestly increase testosterone, especially in men who are stressed, overweight, or have suboptimal levels to begin with. If you suspect your levels are genuinely low, it’s worth knowing the symptoms of low testosterone and getting a proper testosterone test before reaching for any supplement. If your testosterone is already healthy, don’t expect it to turn you into a different person. A ~15% increase on a normal baseline is not going to be the dramatic transformation Instagram promises.

Sperm quality and fertility

This is actually where the evidence is most interesting for Indian men, given that male infertility is more common than most people realize.

Ambiye et al. (2013) conducted a randomized, double-blind, placebo-controlled study on 46 men with low sperm count. They received 675mg of KSM-66 daily for 90 days. The results were notable: sperm count increased by 167%, semen volume by 53%, and sperm motility by 57%. Testosterone also went up by 17% [5].

The same research group (Ahmad/Mahdi et al.) studied 60 infertile men (against 60 fertile controls), giving them 5g/day of ashwagandha root powder for three months, and found improved sperm quality across multiple parameters alongside reductions in oxidative stress markers — this is the body of work behind references [4] and [6], not two separate confirmatory trials.

These are genuinely promising numbers. But before you get too excited — these studies were in men with diagnosed fertility issues, the sample sizes were small, and some of this research was funded by companies that sell ashwagandha supplements.

That said, if you and your partner are struggling to conceive, the first step is a proper semen analysis and a workup with a urologist or andrologist — not a supplement. Suboptimal sperm parameters can point to a varicocele, low testosterone, infection, or (rarely) something more serious, none of which ashwagandha will fix. If you’ve been properly evaluated and your sperm parameters are mildly suboptimal, ashwagandha is one of the few supplements with actual clinical trial data (not just tradition) to support trying it as an adjunct — but it is not a substitute for medical care. And if you are actively trying to conceive, note that ashwagandha is traditionally regarded as a uterine stimulant and is not considered safe in pregnancy, so your partner should not take it.

What about ED and premature ejaculation?

Here’s where we need to be completely straight with you.

There are no high-quality clinical trials showing ashwagandha directly treats erectile dysfunction or premature ejaculation. None. If someone tells you ashwagandha will fix your ED, they’re either misinformed or selling you something.

Could it help indirectly? Possibly. If your erection problems are partly caused by performance anxiety, chronic stress, or mildly low testosterone, then ashwagandha’s effects on cortisol and testosterone might create a slightly better baseline. Some men report improved libido and sexual confidence, which is likely the stress-reduction effect at work.

But if you have a vascular problem, nerve damage, significant hormonal deficiency, or a psychological issue that needs proper treatment — ashwagandha is not going to fix that. Don’t let a supplement delay you from seeing a doctor about something treatable. If erection problems are your main concern, read our complete guide to erectile dysfunction. If stress and anxiety during sex are the real issue, see performance anxiety.

The Ayurvedic perspective — respected, not blindly followed

In Ayurveda, ashwagandha is a vajikarana herb — one that promotes sexual potency and reproductive health. It’s been prescribed for shukra dhatu (reproductive tissue) weakness for centuries. There’s deep wisdom in this tradition, and dismissing it outright would be both arrogant and culturally tone-deaf.

What’s encouraging is that modern science is partially validating these traditional uses. The stress reduction, the modest testosterone support, the improvements in sperm quality — these align with what Ayurvedic practitioners have observed for generations.

Where we need to be careful is in assuming that traditional use equals proof for every claim. Ayurveda uses ashwagandha for dozens of conditions, and the scientific evidence is stronger for some uses (stress, sleep, possibly fertility) than others (direct sexual performance). Respecting the tradition means being honest about what we know and don’t know, not making exaggerated claims that ultimately discredit it.

Dosage, safety, and practical advice

Dosage: Most clinical trials used 300-600mg of KSM-66 ashwagandha root extract daily, typically split into two doses. The raw root powder studies used higher amounts (up to 5g/day), but standardized extracts are more practical and consistent.

Safety: Ashwagandha is generally well-tolerated in studies lasting up to 3 months. The most common side effects are mild — stomach upset, drowsiness, loose stools. It’s considered safe for most healthy adults at recommended doses [7].

However, you should NOT take ashwagandha if you:

  • Have hyperthyroidism or a nodular/overactive thyroid — ashwagandha can raise thyroid hormone levels, and case reports describe it triggering thyrotoxicosis (palpitations, weight loss, anxiety, a racing heart) [9]. Anyone on thyroid medication or with thyroid disease should not take it without endocrinologist supervision.
  • Are on medications for diabetes, blood pressure, or immunosuppressants (potential interactions)
  • Have an autoimmune condition (it can stimulate the immune system)
  • Are about to have surgery (may affect anesthesia and blood sugar)
  • Drink alcohol heavily or take benzodiazepines or sleep medication — ashwagandha can add to their sedative effect, so expect more drowsiness if you combine them.
  • Have liver concerns — there have been case reports of liver injury, though causation isn’t fully established [8]. Stop immediately and seek care if you develop jaundice (yellowing of the eyes or skin), dark urine, persistent nausea, or pain in the right upper abdomen; injury typically shows up 2-12 weeks after starting.

What to buy: Look for KSM-66 or Sensoril (another standardized extract) on the label. Buy from brands that provide third-party testing certificates. The Indian supplement market has a quality control problem — not every “ashwagandha” capsule contains what it claims.

How long to try it: Give it at least 8-12 weeks. The effects are gradual, not immediate. If you don’t notice anything after 3 months, it’s probably not going to work for you.

Cycling: Most practitioners recommend 8-12 weeks on, then a break. Continuous indefinite use hasn’t been studied for safety.

The limitations we need to acknowledge

Let’s be honest about the problems with the current evidence:

  1. Small sample sizes. Most studies had 40-80 participants. That’s a start, but it’s not definitive.

  2. Industry funding. Several key studies were funded by companies that make ashwagandha extracts. This doesn’t automatically invalidate the results, but it’s a conflict of interest worth noting.

  3. Short duration. Most trials ran 8-16 weeks. We don’t have great long-term safety or efficacy data.

  4. Publication bias. Studies that find positive results are more likely to get published. There may be negative studies we never see.

  5. Population specificity. Results in stressed, overweight, or infertile men may not apply to you.

This doesn’t mean ashwagandha doesn’t work. It means we should hold the evidence with open hands rather than treating it as gospel.

So should you take it?

Ashwagandha is not snake oil, and it’s not a miracle cure. It sits in a middle ground that’s harder to sell on Instagram but more honest: it’s a modestly effective supplement that may help some men with stress-related sexual issues, mildly low testosterone, or suboptimal sperm quality.

If your sexual problem is driven by chronic stress, poor sleep, and the cortisol load of modern Indian life — ashwagandha (300-600mg KSM-66 daily) is a reasonable thing to try alongside lifestyle changes. It’s one of the few traditional remedies where clinical evidence partially backs up the traditional claims. But do not stop or replace any prescribed treatment — for ED, premature ejaculation, low testosterone, or fertility — with ashwagandha. At most it’s an add-on, never a substitute for medical care.

If you’re hoping it will cure your ED, fix premature ejaculation, or turn you into a sexual athlete — it won’t. See a doctor for those issues. A proper diagnosis and treatment plan will do more for you than any supplement.

And if you do try it, buy a quality product, give it 8-12 weeks, and pay attention to whether you actually feel different — not whether Instagram tells you it should be working.

Curious about other traditional supplements? Read our evidence review of shilajit for men’s health.

References:

[1] Langade D, et al. (2019). Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-controlled Study. Cureus, 11(9): e5797.

[2] Chandrasekhar K, et al. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 34(3): 255-262.

[3] Lopresti AL, et al. (2019). A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha (Withania somnifera) in Aging, Overweight Males. American Journal of Men’s Health, 13(2).

[4] Ahmad MK, et al. (2010). Withania somnifera improves semen quality in stress-related male fertility. Evidence-Based Complementary and Alternative Medicine, 7(1): 137-144.

[5] Ambiye VR, et al. (2013). Clinical Evaluation of the Spermatogenic Activity of the Root Extract of Ashwagandha (Withania somnifera) in Oligospermic Males: A Pilot Study. Evidence-Based Complementary and Alternative Medicine, 2013: 571420.

[6] Mahdi AA, et al. (2011). Withania somnifera Improves Semen Quality in Stress-Related Male Fertility. Evidence-Based Complementary and Alternative Medicine, 2011: 576962.

[7] Tandon N, Yadav SS. (2020). Safety and clinical effectiveness of Withania Somnifera (Linn.) Dunal root in human ailments. Journal of Ethnopharmacology, 255: 112768.

[8] Björnsson HK, et al. (2020). Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network. Liver International, 40(4): 825-829.

[9] Kamal HI, et al. (2022). Ashwagandha as a Unique Cause of Thyrotoxicosis Presenting With Supraventricular Tachycardia. Cureus, 14(3): e23494. https://pmc.ncbi.nlm.nih.gov/articles/PMC9035336/