About Ashwagandha

Root used in Ayurvedic medicine to help the body handle stress and support overall vitality.

Our Take

We like to test supplements here (it's kind of our thing). And with ashwagandha being as popular as it is, I thought I would give it a shot.

I'll admit, I didn't make it long before discontinuing. After just two weeks of continued use, I, like a small number of other users, experienced increased anxiety and even nightmares. These are not common occurrences in my life, and I decided to end my test shortly after. Adverse effects ended after discontinuation.

Like I mentioned in user experience, most users report positive benefits, but the potential for negative effects is not to be overlooked.

Effectiveness Scores

Stress Management: 8.0/10 (moderate evidence).
Ashwagandha helps the body handle stress by calming the system that controls your stress hormones. It can lower cortisol (the body’s primary stress hormone) and support a more balanced stress response. Its active compounds also have a calming effect on the brain and may ease tension and restlessness.
Why this rating: This is one of the best-studied uses for ashwagandha, and it's shown to reliably lower cortisol. Where it gets less certain is whether that actually translates into feeling less stressed day to day. Some research says yes; other research finds the hormone changes without people reporting they feel calmer. Worth trying, but go in expecting a steadier baseline rather than a dramatic shift in how stressed you feel.
Sleep Quality: 7.0/10 (moderate evidence).
Ashwagandha helps the body relax by boosting calming brain signals and lowering stress hormones that interfere with sleep. This can help you fall asleep faster, stay asleep longer, and improve overall sleep quality.
Why this rating: This holds up well, especially if you already struggle with sleep. But this isn't an immediate solution like melatonin or chamomile. The benefit builds over weeks, and it's most reliable when taken consistently. Results could take up to two months.
Increase Testosterone: 7.0/10 (moderate evidence).
Ashwagandha may help boost testosterone by reducing stress and directly supporting the hormonal signals that regulate testosterone production.
Why this rating: There's real, consistent evidence that ashwagandha raises testosterone, especially in men who are older, under a lot of stress, or already running low. If you're in one of those groups, this is one of ashwagandha's stronger, better-supported benefits. If you're a healthy man with normal testosterone levels, there's promising newer research too, but it's thinner, so treat it as worth trying rather than a guaranteed outcome.
Anxiety Relief Mild-moderate anxiety: 7.0/10.
Ashwagandha's calming effect on the brain and its influence on stress hormones can ease feelings of anxiety alongside the physical tension that comes with it. This shows up on anxiety rating scales, not just on how stressed people say they feel day to day.
Why this rating: This is one of ashwagandha's more dependable benefits. Multiple studies find a real drop in anxiety, not just stress in general. Most of that evidence comes from everyday stress and mild anxiety, not a diagnosed anxiety disorder.
Good to know: this isn't a substitute for treatment of a diagnosed anxiety disorder. If you're on medication for anxiety or depression, talk to your doctor before adding this, since there isn't enough research to know how it interacts with those.
Enhance Physical Performance: 6.0/10 (moderate evidence).
Ashwagandha may improve strength, endurance, and recovery. It's been shown to increase muscle power, boost VO₂max (a measure of cardio fitness), and reduce muscle damage and soreness after hard workouts. Its anti-inflammatory and stress-reducing effects likely contribute to faster recovery.
Why this rating: If you already train regularly, the evidence for strength and endurance gains is genuinely strong. If you're not currently active, you may not experience the same benefit. It appears to be less beneficial for people who are trying to build a base and more so for people who are trying to get more out of an already high level of training.
Improve Male Fertility Men, low sperm count: 6.0/10.
Ashwagandha appears to support sperm production and quality, likely by reducing oxidative stress in reproductive tissue and supporting the hormonal signals involved in sperm development.
Why this rating: The clearest results are in men who already had lower sperm counts to begin with, where the improvements are large. Promising newer research suggests healthy men may benefit too, but that evidence is thinner and newer. If fertility is why you're considering this, treat it as support alongside medical guidance rather than a fix on its own.
Cognitive Performance: 5.0/10 (moderate evidence).
Ashwagandha may support mental clarity and focus by lowering oxidative stress in the brain, boosting BDNF (a protein that supports learning and memory), and balancing brain chemicals involved in calmness and alertness. These effects may help with attention, working memory, and mental processing, especially when stress is high.
Why this rating: There's a decent amount of research on this, especially for memory and mental clarity when stress is what's driving it, but the evidence itself is thinner than the numbers make it look. It's not that people are overselling it; the studies behind the biggest results just aren't strong yet. Worth trying if brain fog shows up alongside your stress.

Understanding Effectiveness Scores

What does this mean?

Our effectiveness scoring system is based on scientific research and evidence. Each health outcome is rated on a scale of 1-10, with higher scores indicating stronger scientific support for the supplement's effectiveness.

1/10: Scientific evidence concludes that supplement is ineffective for purpose
2/10: No scientific evidence supports effectiveness
3/10: Inconclusive results regarding effectiveness
4/10: Minimal research on effectiveness
5/10: Limited evidence of effectiveness; may have potential benefits, but more research is needed
6/10: Some evidence supports the supplement's effectiveness, but research is mixed
7/10: Moderate evidence shows the supplement is effective for certain purposes, with limited population studies
8/10: Solid evidence suggests the supplement is effective, but research is not as extensive as higher levels
9/10: Strong scientific evidence supports the supplement's effectiveness, but some minor gaps in research remain (e.g., limited long-term studies or specific populations).
10/10: Ample scientific research demonstrates that the supplement is both highly effective and safe for long-term use.

Dosage & Timeline

Standard Dosages

600 mg daily is the standard dosage for most benefits to take effect
500-1,000 mg per day, divided into two doses, is recommended for athletic performance. However, this is not as well-tested. More research is needed to confirm whether dosages above 600 mg provide greater benefits.

Important note: Withanolide percentage is an important metric when evaluating ashwagandha supplements. Products generally range from 1% to 10% withanolides, and many people look for at least 2.5% as a baseline for a standardized extract.

Timeline to See Results

Stress and anxiety: some effect within 2 to 4 weeks, though it starts small
Sleep: trials show the strongest effect at 8 or more weeks and at 600 mg or more; some people notice a difference sooner, but that's not what the evidence is built on
Cognitive function: usually 4 to 8 weeks of consistent use
Athletic performance: 4 to 12 weeks
Testosterone: studies measuring hormone changes in men typically run 12 weeks
Fertility (sperm count and motility): studies measuring this typically run 90 days

Safety Information

Ashwagandha is generally considered safe for most people when taken in appropriate doses. (300-600 mg)

However, there are major concerns for people with pre-existing liver or thyroid conditions. Liver toxicity represents the most serious documented concern. Some studies report liver injury developing 2-12 weeks after supplementation.

Denmark banned ashwagandha supplements in 2023. The risk assessment that led to it was centered on its effects on thyroid and reproductive hormones and concluded that a safe lower dose couldn't be established.

As of 2026, the UK, France, Germany, and several other countries have opened safety reviews or issued cautions, but none besides Denmark has banned it outright.

Autoimmune conditions: Ashwagandha appears to stimulate immune activity, which is the opposite of what someone with an autoimmune condition or on immune-suppressing medication needs.

Pregnancy and breastfeeding: Avoid. Ashwagandha has been linked to effects on reproductive hormones, and there isn't enough safety data in pregnant or breastfeeding people to know how it behaves.

Side Effects

Common side effects:

Mild digestive discomfort (nausea, diarrhea, stomach upset)
Drowsiness or sedation, especially when combined with other sedative medications

Rare side effects:

Hormonal effects due to its potential influence on thyroid and reproductive hormones
Potential allergic reactions. This is most common with people with known allergies or sensitivities to plants in the Solanaceae family (like tomatoes, peppers, or eggplant).
Thyrotoxicosis has been reported with higher doses, causing anxiety, rapid heart rate, and weight loss.

Lowering your odds: start at a lower dose, take it with food if it upsets your stomach, and don't combine it with other sedating supplements or medications without checking first.

Usage Information

Most people take ashwagandha to lower stress and anxiety and improve sleep. The other uses are testosterone and fertility support in men, physical performance and recovery, and improving mental clarity when stress is the underlying issue.

Ashwagandha is a helper, not a treatment. No study has shown it treats a diagnosed condition, and it should never replace medication prescribed for thyroid disease, anxiety, or any other condition.

User Experience

Gathered from reviews and forum posts, not from studies. What people report tells you what to expect. It does not tell you whether something works.

Most people who try ashwagandha report positively. The most common mentions are better sleep, feeling less stressed, a steadier mood, and more energy. People using it for athletic performance usually say it took 8 to 12 weeks before they noticed a real difference, which lines up with what trials show.

A smaller group reports the opposite experience. Reviews include more anxiety, digestive issues, worse sleep, or feeling oversedated. It's a small minority, but it's consistent enough across reviews that it's worth expecting as a real possibility.

Alternative Names

Withania somnifera, Indian ginseng

Ashwagandha