Two vegetarian capsules supplying 1,000 mg of ashwagandha root material (600 mg KSM-66 extract plus 400 mg ground root) and 20 mg ginger extract; 60 capsules, 30 servings; Youtheory.
The 600 mg of extract is the part that matches a dose used in published trials; the 400 mg of powder is plain dried root. No withanolide percentage is printed.
Adults under sustained pressure who sleep unevenly, want to try an eight-week course of a widely studied root extract at a trial-matching amount, and have told their clinician.
Not for pregnancy or nursing. Ask first if you take thyroid, blood-sugar, blood-pressure, sedative or immune-suppressing medicines. Rare liver-related reports exist. Stop before surgery.
What the label shows
We read the Supplement Facts panel from the label photographs on the Amazon listing and from Youtheory's product page on September 30, 2026. Unusually for a "blend," the panel itemizes what is inside it.
| Ingredient | Amount per serving | What to know |
|---|---|---|
| Full Spectrum Ashwagandha Blend | 1,000 mg — no Daily Value established | The headline number. It is the sum of the two root ingredients below, which are not equivalent to each other. |
| Organic ashwagandha (root) extract, KSM-66 | 600 mg | A concentrated root-only extract from Ixoreal Biomed. 600 mg a day is within the 250 to 600 mg a day of KSM-66 used in the sleep trials the NIH Office of Dietary Supplements summarizes, and at the top of the range where its stress summary saw the larger benefit [1]. The label prints no standardization; ODS describes the KSM-66 used in one sleep trial as standardized to more than 5% withanolides [1]. |
| Organic ashwagandha (root) powder | 400 mg | Dried, ground root, not an extract. The one stress trial in the ODS summary that used whole root gave 12,000 mg a day of root granules, which ODS equates to 6,000 mg of root powder [1], so 400 mg is a token amount that mainly lifts the number on the front. |
| Ginger (root) extract, Gingever | 20 mg — no Daily Value established | A small addition with no stated purpose on the label. It is worth knowing about only if you avoid ginger. |
| Other ingredients | — | Vegetarian capsule (hypromellose), microcrystalline cellulose, vegetable magnesium stearate, silicon dioxide. |
Serving size is two capsules, 30 servings per bottle, with the bottle's direction "(Adults) Take two (2) capsules per day with water"; Youtheory's page suggests starting at one capsule and stepping up [6]. The listing images call the product vegetarian, dairy-free, soy-free and gluten-free, and the panel states that it "is manufactured in a facility that processes fish extracts," which matters to anyone with a fish allergy. The warning on the listing images says to check with your doctor if you take medication or have any medical condition and not to use it if you are pregnant or nursing; Youtheory's page adds that it is not intended for anyone under 18 [6]. Both root ingredients are labeled organic, but we did not see a USDA Organic seal on the label images, so we do not credit one. No third-party testing seal is printed. The Amazon listing has a bullet headed "Third-Party Tested," but its text describes in-house manufacturing in the company's own GMP facility and names no laboratory, and Youtheory's own product page, answering a customer question, says this product "is not third-party tested but undergoes rigorous in-house quality and purity testing" [6]. We go by the manufacturer's own answer. KSM-66 itself is an ingredient trademark, not a certification.
What the evidence shows
Ashwagandha (Withania somnifera) is a shrub whose root has a long history in Indian traditional practice; its withanolides are the compounds most often credited with its effects, though other constituents may contribute [1]. Almost all modern trials used branded extracts rather than plain root, and the NIH Office of Dietary Supplements is precise about which: root-only KSM-66 in most, root-and-leaf extracts (Sensoril, Shoden) in others [1]. That is why the split on this label matters. The 600 mg of KSM-66 is a trial-matching amount; the 400 mg of powder is not.
On stress, ODS summarizes a 2021 review of seven trials with 491 adults in India given 240 to 1,250 mg of extract a day (one trial used root granules instead) for six to eight weeks: lower scores on stress and worry rating scales, less sleeplessness and fatigue, and lower cortisol readings than placebo, with the benefit generally larger at 500 to 600 mg a day [1]. A separate 2022 meta-analysis of 12 randomized trials with 1,002 participants aged 25 to 48 also found lower perceived stress than placebo and located the stress effect at 300 to 600 mg a day, but the trials disagreed with each other so much that the authors rated the certainty of the evidence low [2]. On sleep, a 2021 meta-analysis of five randomized trials with 400 adults found a small but real improvement in overall sleep measures, more evident at 600 mg a day or more and after at least eight weeks, and noted that safety data were limited [3]; the sleep trials ODS summarizes used 250 to 600 mg a day of KSM-66, apart from one that used a different root-and-leaf extract [1]. A 2024 review of five trials with 254 people reached a similar "promising, but larger trials needed" conclusion [4]. Keep in view: most participants were between 18 and 55, so there is thin data for readers past 60, and the trials ran eight to twelve weeks, so a few days of use tells you nothing.
The seller's statements on the bottle, listing and product page, "helps reduce stress," "supports relaxation and stress response," "promotes restful sleep at night" and "boosts mental and physical performance," are structure/function claims carrying the standard FDA disclaimer [6]. The listing's description of KSM-66 as "the highest concentration Ashwagandha root extract available" is likewise the seller's claim; neither the label nor the product page prints a withanolide percentage for it.
Safety is where this herb differs from most items in this category. In trials it was well tolerated for up to about three months, with loose stools, nausea and drowsiness the usual complaints; safety over many months or years is unknown [1]. Both ODS and NCCIH note a number of case reports linking ashwagandha products to liver injury, which appears rare and in the reported cases resolved after stopping; some involved combination products, and the product contents were not always independently verified [1] [5]. Small studies and case reports suggest it can shift thyroid laboratory values, which is why ODS flags a possible interaction with thyroid medication and NCCIH advises against use by people with thyroid or autoimmune conditions [1] [5]. Further possible interactions listed by ODS: blood-sugar medicines, blood-pressure medicines, immune-suppressing medicines and sedatives [1]. In pregnancy, some experts advise against it because of reports suggesting a risk of pregnancy loss; France's food-safety agency issued a 2024 statement against use by pregnant and breastfeeding women and people with endocrine conditions [1]. NCCIH adds: stop before surgery [5].
Three cautions carry more weight than the rest: do not use it in pregnancy or while nursing; if you take thyroid medication, do not add this without your prescriber knowing; and if you notice dark urine, yellowing of the eyes or unexplained fatigue while taking any ashwagandha product, stop and get it checked, because rare liver-related reports exist [1] [5].
Who it may suit, and who should look elsewhere
This is a product for a defined trial period, agreed with a clinician, not a daily fixture. Situations, not diagnoses:
- May suit: adults past 40 living through a stretch of sustained pressure, sleeping unevenly, who want to try a widely studied root extract at 600 mg a day for eight weeks and then judge honestly whether anything changed.
- May suit: vegetarians, and people who want the extract itemized on the panel rather than hidden in an unnamed blend.
- Ask a pharmacist or clinician first: anyone on thyroid medication, blood-sugar or blood-pressure medicines, immune-suppressing medicines, sedatives or sleep medicines; the interaction list is the longest of any product in this category.
- Look elsewhere: pregnant or nursing women; anyone with a thyroid or autoimmune condition; anyone with a history of liver trouble; anyone with surgery coming up, which NCCIH lists as a reason not to use it [5].
- Look elsewhere: people with a fish allergy who prefer not to rely on a shared-facility statement, and anyone who avoids ginger.
- Adjust expectations: the trials measured rating-scale changes over two to three months in people mostly under 55; it is not a same-evening sedative.
Price, size and where it is sold
On September 30, 2026 the Amazon listing for ASIN B07TWS9XVN showed "Youtheory Ashwagandha, 1,000 mg, 60 Vegetarian Capsules, 30-Day Supply" at $16.79, in stock, shipped from Amazon and sold by a third-party merchant, Pattern Products. That is about 56 cents a day at two capsules. The listing was marked "non-returnable due to food safety reasons," although Amazon's general policy allows most items back within 30 days of delivery [7]; check the return line before ordering. Youtheory also sells a 90-capsule bottle of the same formula.
Sources
- National Institutes of Health, Office of Dietary Supplements. Ashwagandha fact sheet for health professionals: efficacy for stress and sleep, extracts and doses studied, safety. Updated May 2, 2025. link
- Phytotherapy Research, 2022. Systematic review and dose-response meta-analysis of 12 randomized trials of ashwagandha for stress and worry. PubMed record. link
- PLoS One, 2021. Systematic review and meta-analysis of five randomized trials of ashwagandha extract on sleep. PubMed record. link
- Human Psychopharmacology, 2024. Systematic review and meta-analysis of five randomized trials of Withania somnifera for worry and sleep outcomes. PubMed record. link
- National Center for Complementary and Integrative Health (NIH). Ashwagandha: usefulness and safety. Updated March 2023. link
- Youtheory. Ashwagandha product page: Supplement Facts, directions and seller claims. link
- Amazon.com. "About Our Returns Policies" help page, opened September 30, 2026 (general 30-day return window; non-returnable categories). Not linked: this site links to Amazon only through product listings.
This report is educational and is not medical advice. Ask a qualified clinician before starting any supplement, especially if you are pregnant, nursing, or take medication.