The short answer: for most healthy adults, a root extract called KSM-66 at 300 mg twice a day is the best-studied way to take ashwagandha, and Jarrow Formulas sells the simplest version of it. If you want a product with an independent certification seal, Thorne is the pick. On a tight budget, NOW Foods does the job. And if you cannot swallow capsules, Hawaii Pharm makes an alcohol-free liquid.
Ashwagandha is not for everyone, though. Before you buy anything, read who should skip it. That section matters more than the rankings.
How we chose: we have not run our own lab tests or long-term trials on these products. We compared each label against the doses used in published human studies, checked which extract it uses, and looked for independent quality certification, using the same twelve questions in our free Clean Supplement Checklist. Prices and labels change, so check the current label before you buy. Last reviewed September 2026.
Our picks at a glance
| Pick | Best for | Extract | Per serving |
|---|---|---|---|
| Jarrow Formulas Ashwagandha | Best overall | KSM-66 (root) | 300 mg, taken twice daily |
| Thorne Ashwagandha | Independently certified | Shoden (root and leaf) | 120 mg, once daily |
| NOW Foods Ashwagandha | Budget | Standardized (root and leaf), min. 2.4% withanolides | 450 mg |
| Sports Research Ashwagandha | Softgel lovers | Shoden plus root powder | 500 mg softgel |
| Hawaii Pharm Alcohol-Free Extract | No capsules | Liquid root glycerite (not standardized) | 1 ml |
1. Jarrow Formulas Ashwagandha: best overall
This is KSM-66, a root-only extract its maker standardizes to at least 5% withanolides, which lines up with the extract type an international task force recommends for anxiety (300 to 600 mg a day of root extract standardized to 5% withanolides). Jarrow’s directions are one 300 mg capsule twice a day, which lands exactly on 600 mg, the dose where benefits looked strongest in the research. A 120-capsule bottle is a two-month supply.
What we like
- Clinically studied extract at a clinically studied dose
- Short ingredient list, vegan, gluten-free
- Two-month supply per bottle
Watch out for
- No independent certification seal on the product page
- Withanolide percentage not printed on Jarrow’s own page
2. Thorne Ashwagandha: best independently certified
Thorne uses Shoden, a concentrated root-and-leaf extract, at 120 mg in a single daily capsule. That matches the 120 mg a day root-and-leaf dose used in some of the sleep research. The main reason to pay more is quality assurance: Thorne’s listing describes it as NSF Contents Certified, meaning an independent lab checks that what is on the label is in the capsule.
What we like
- One capsule a day
- Independent NSF certification (per the listing)
- Very short ingredient list
Watch out for
- Most expensive per day of our picks
- Only 30 capsules per bottle
- Root-and-leaf extract, while most anxiety trials used root only
3. NOW Foods Ashwagandha: best budget pick
NOW’s 450 mg capsule is a root-and-leaf extract standardized to a minimum of 2.4% total withanolides, and it is usually the cheapest per day of anything on this list. NOW’s manufacturing is GMP certified by Intertek. The trade-off is that this is not one of the branded extracts used in most trials, so it is harder to match directly to the research.
What we like
- Lowest cost per day
- GMP certified manufacturing (Intertek)
- Several bottle sizes
Watch out for
- Not KSM-66 or Shoden
- Lower withanolide standardization than the branded extracts
- Label suggests up to three capsules a day, more than most people need
4. Sports Research Ashwagandha: best softgel
If capsules bother your stomach, Sports Research puts Shoden extract (35% withanolides) plus ashwagandha root powder into a plant-based softgel with coconut MCT oil. It is Non-GMO verified and NSF gluten-free certified, and the brand says it is third-party tested.
What we like
- Shoden extract in an easy-to-swallow softgel
- Non-GMO verified, NSF gluten-free certified
Watch out for
- ‘Third-party tested’ without naming the lab or publishing results
- Adds oils and a powder blend you may not need
5. Hawaii Pharm Alcohol-Free Liquid Extract: best if you cannot swallow pills
A liquid dried-root extract in vegetable glycerin and water, with no alcohol and no added sugar. You take 1 ml (about a dropper) in water, juice or tea, and a 2 oz bottle holds 60 servings. Hawaii Pharm identity-tests its herbs by HPTLC or FTIR and screens batches for microbes.
Be clear on the limitation: liquid extracts like this are not standardized to withanolides, so you cannot line the dose up with the studies the way you can with KSM-66 or Shoden. Choose it for the format, not for research-matched dosing.
What we like
- No capsules, no alcohol, no added sugar
- Identity and microbial testing
- Easy to adjust the dose drop by drop
Watch out for
- Not standardized, so not directly comparable to study doses
- Glycerin taste is not for everyone
- Refrigerate after opening
What the research actually says
A 2021 systematic review of seven trials in 491 adults found that ashwagandha reduced stress and anxiety scores, sleeplessness and cortisol compared with placebo. Doses ranged from 240 to 1,250 mg a day of extract, and benefits looked greater at 500 to 600 mg a day than at lower doses. A separate 2021 analysis of five sleep trials found the clearest improvement at 600 mg a day taken for at least eight weeks.
Two honest caveats: most trials were small, short (6 to 12 weeks) and run in India, and many were funded by extract makers. The evidence is promising, not settled.
How much to take
- KSM-66 or similar root extract: 300 to 600 mg a day, often split into two doses.
- Shoden: 120 to 240 mg a day.
- Give it time: most studies ran six to eight weeks or longer before measuring results.
- Keep it short: it appears well tolerated for up to about three months. There is little safety data beyond that.
Who should skip ashwagandha
Talk to your doctor or pharmacist before taking ashwagandha, and skip it entirely if any of these apply:
- Pregnancy or breastfeeding. Experts advise against it.
- Thyroid conditions or thyroid medication. Studies have shown changes in thyroid hormone levels, and there are case reports of an overactive thyroid.
- Liver disease, or any sign of liver trouble. There are case reports of serious liver injury. Stop and see a doctor if you notice yellowing skin or eyes, dark urine or unusual fatigue.
- Medications for diabetes, blood pressure, immune suppression or sleep. Ashwagandha may interact with them.
- Hormone-sensitive prostate cancer. It may raise testosterone.
Regulators are cautious too: Denmark banned ashwagandha in 2023, and France’s food safety agency advised against it in 2024 for pregnant and breastfeeding women and people with endocrine disorders.
What to look for on the label
- A named extract (KSM-66, Shoden or Sensoril) or a stated withanolide percentage
- The plant part: root, or root and leaf
- An amount per capsule that fits the doses above, with no proprietary blend
- An independent seal such as NSF, USP or Informed Choice, if you want the extra assurance
Frequently asked questions
Should I take ashwagandha in the morning or at night?
Either works. Many trials split the dose between morning and evening. Some people find it makes them drowsy, so if that happens, take it at night.
How long does ashwagandha take to work?
Most studies measured results after six to eight weeks, so give it at least a month before judging. If you notice nothing after two months, it is probably not for you.
Is KSM-66 better than Shoden?
Neither has been shown to be better in a head-to-head trial. KSM-66 is root-only and has more published studies. Shoden is more concentrated, so the dose is smaller. Pick based on your budget and how many capsules you want to take.
