Short answer: If you want the form used in the best-known stress and sleep trials, choose a standardized root extract, with the caveats below. Most of the well-known stress and sleep trials cited here used KSM-66, a root-only extract (Sources 2-4). Sensoril, a root-and-leaf extract, was tested at lower doses in a maker-funded trial (Source 5). Plain root powder is the traditional Ayurvedic form, but it has far less modern testing. Gummies and teas are hard to judge unless the label states the extract, the amount and the plant part.
Before choosing any form, read who should not take ashwagandha at all. Pregnancy, thyroid and autoimmune conditions, liver disease and several medicines rule it out or call for a clinician first. That list, the traditional uses and the full evidence are on our ashwagandha herb profile. This page is only about forms.
How Do the Forms of Ashwagandha Compare?
The forms differ in plant part, concentration and how much research stands behind them. The doses below are the ones used in the cited studies or official references. They are not a recommendation for you. A higher withanolide percentage or a smaller milligram dose does not make one extract stronger or better than another.
| Form | What it is | Doses studied or referenced | Research behind it | Practical notes |
|---|---|---|---|---|
| Root powder (churna) | Dried root, ground. Usually not standardized. | 3 to 6 g a day (Source 1) | Traditional use. The trials cited here tested extracts instead. | Bitter and earthy. Traditionally simmered in warm milk. The dose by weight is far larger than an extract. |
| KSM-66 | Root-only extract, standardized to at least 5% withanolides by HPLC (Source 2) | 250 to 600 mg a day (Sources 2-4) | Several randomized trials on stress and sleep | Capsules. The cited trials used product supplied by the manufacturer. |
| Sensoril | Water extract of root and leaf, standardized to at least 10% withanolide glycosides and no more than 0.5% withaferin A (Source 8) | 125 to 500 mg a day for 8 weeks (Source 5) | One 8-week stress trial cited here, funded by the maker | Lower dose per capsule. Contains leaf (see below). |
| Gummies, teas, blends | Varies. May be an unnamed extract, plain powder or dried root in a tea, sometimes mixed with other herbs | Depends on the label | A PubMed search in October 2026 found no randomized trial of an ashwagandha gummy or a plain ashwagandha tea | Convenient, but check the label for milligrams, form and plant part. |
Two cautions apply to the whole table. First, the doses are not interchangeable: 300 mg of a concentrated extract is not the same as 300 mg of powder. Second, each trial cited here was small (60 to 150 participants) and short (6 to 10 weeks). The KSM-66 trials used product supplied by its maker, and the Sensoril trial was funded by its maker (Sources 2-6). The results are promising, not settled.
Root or Leaf: Why Does It Matter?
Ayurveda uses the root, and India now restricts the leaf. The Ayurvedic Pharmacopoeia of India lists the root (Source 1), and the KSM-66 trials cited here used root only (Sources 2-4).
The leaf has a different chemical profile. In April 2026, India's Ministry of Ayush directed manufacturers to use only ashwagandha root and prohibited leaf in Ayush products. The national food regulator (FSSAI) then issued an advisory against leaf in food products. The stated reason was possible safety concerns from higher levels of reactive withanolides in the leaf, particularly withaferin A (Source 9). These are Indian rules, and they do not ban root-and-leaf extracts in the US. The makers of Sensoril and Shoden, both root-and-leaf extracts, have said they are asking Indian regulators to reconsider (Source 9).
Check the label for the plant part. If it says "root and leaf" or just "whole herb," you are buying something different from the root that Ayurveda and the KSM-66 trials used.
Which Ashwagandha Is Best for Sleep or Daytime Stress?
No form has been shown to be best for one goal over the other. Trials for both goals used standardized extracts:
- Sleep. A 10-week trial in people with insomnia used KSM-66 at 300 mg twice daily and found faster sleep onset than placebo (Source 4). A separate 6-week trial gave 120 mg of Shoden once daily to healthy adults with unrefreshing sleep, and also found better sleep measures than placebo (Source 6). The two trials studied different people and products, so they cannot be compared directly. The Sensoril stress trial gave its capsule about half an hour before bed (Source 5).
- Daytime stress. Trials of KSM-66 and Sensoril found lower perceived stress than placebo after 8 weeks at the doses in the table (Sources 3 and 5).
When to take it depends on how it affects you. The sleep trials above gave it at night or twice a day. If it leaves you groggy the next morning or alert at night, do not keep pushing through. Review the product and timing with a clinician or pharmacist. If you have a thyroid or liver condition, are pregnant or breastfeeding, or take sedatives or immunosuppressants, speak with a clinician before taking it at any time of day.
What Should You Expect in the First 4 Weeks?
The trials measured their results at 6 to 10 weeks, so they do not tell you what to expect at four weeks (Sources 3-6). Use the first month mainly to notice how you are tolerating it.
- Change one thing at a time. Starting one new product at a time makes it easier to tell which one is behind any change you notice.
- Write it down. A short daily note on sleep and stress gives you something concrete to compare at week 6 or 8.
- Stop and get medical care if you notice yellowing of the skin or eyes, dark urine, or persistent itching. Jaundice and itching were the main signs in published cases of rare ashwagandha-linked liver injury (Source 11), and NCCIH notes that such cases have been reported (Source 10). More detail is on our ashwagandha herb profile.
- Stop and talk to a clinician if you have daytime drowsiness, stomach upset, palpitations or feel unusually wired. NCCIH lists drowsiness and stomach upset as possible side effects and advises against ashwagandha for people with thyroid disorders (Source 10).
What Should You Look For on the Label?
Look for four things: the plant part, the extract and its standardization, the amount per serving, and independent testing.
- Plant part. "Root" or "root extract." Be cautious with "root and leaf" or no part named.
- Extract and standardization. A named extract or a stated withanolide percentage, ideally measured by HPLC. A bare "ashwagandha 500 mg" tells you little.
- Amount per serving. This is the figure to compare with the trial doses in the table. With gummies, check how many you would need to take to reach that amount.
- Independent testing. Look for a certificate of analysis that reports heavy-metal testing. Not every seal or certificate covers metals. A 2008 JAMA study found lead, mercury or arsenic in about 1 in 5 Ayurvedic products bought online, from both US and Indian manufacturers (Source 7).
For specific products checked against these criteria, see our ashwagandha supplement guide.
Frequently Asked Questions
What is the best form of ashwagandha? If you want the form used in the best-known trials, a standardized root extract: most of the trials cited here used KSM-66. Root powder is the traditional form but has less modern testing, and gummies are hard to compare unless the label states the extract and amount.
Is KSM-66 or Sensoril better? Neither has been tested head to head. KSM-66 is a root-only extract tested in several trials. Sensoril is a root-and-leaf extract used at lower doses, and the trial cited here was funded by its maker.
Is ashwagandha root powder as good as an extract? It is the traditional Ayurvedic form, referenced at 3 to 6 g a day, but the trials cited here tested extracts. Their results may not apply to powder.
Should I avoid ashwagandha leaf? Be cautious. In 2026 India prohibited leaf in Ayush products and advised against it in food products, citing withaferin A. Ayurveda uses the root.
Are ashwagandha gummies worth it? They are convenient, but a PubMed search found no randomized trial of an ashwagandha gummy. Check the milligrams, the extract and the plant part before buying.
Sources
- WHO (2009). "Radix Withaniae." WHO Monographs on Selected Medicinal Plants, Volume 4. Geneva: World Health Organization. Posology: 3-6 g dried powdered root, citing the Ayurvedic Pharmacopoeia of India.
- Chandrasekhar K, Kapoor J, Anishetty S (2012). Indian Journal of Psychological Medicine 34(3): 255-262. doi:10.4103/0253-7176.106022 (KSM-66, root only, at least 5% withanolides by HPLC)
- Salve J, Pate S, Debnath K, Langade D (2019). Cureus 11(12): e6466. doi:10.7759/cureus.6466 (KSM-66, 250 and 600 mg a day, 8 weeks)
- Langade D, Kanchi S, Salve J, Debnath K, Ambegaokar D (2019). Cureus 11(9): e5797. doi:10.7759/cureus.5797 (KSM-66, insomnia, 10 weeks)
- Pandit S, Srivastav AK, Sur TK, et al. (2024). Nutrients 16(9): 1293. doi:10.3390/nu16091293 (Sensoril root and leaf, 125 to 500 mg a day, funded by Natreon)
- Deshpande A, Irani N, Balkrishnan R, Benny IR (2020). Sleep Medicine 72: 28-36. doi:10.1016/j.sleep.2020.03.012 (Shoden, 120 mg a day, 6 weeks)
- Saper RB, Phillips RS, Sehgal A, et al. (2008). "Lead, mercury, and arsenic in US- and Indian-manufactured Ayurvedic medicines sold via the Internet." JAMA 300(8): 915-923. doi:10.1001/jama.300.8.915
- NutraIngredients (2014). "NutraGenesis lauds Sensoril's double digit growth" (Sensoril root and leaf, at least 10% glycowithanolides, no more than 0.5% withaferin A).
- NutraIngredients (28 April 2026). "India bans ashwagandha leaf use in any form, industry reacts" (Ministry of Ayush and FSSAI leaf restrictions; manufacturer responses).
- National Center for Complementary and Integrative Health (2023). "Ashwagandha." Fact sheet, last updated March 2023. https://www.nccih.nih.gov/health/ashwagandha
- Björnsson HK, Björnsson ES, Avula B, 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. doi:10.1111/liv.14393