NOW FoodsKSM-66 Ashwagandha 600 mg

90 vegan capsules; root extract · UPC 733739046338

The NOW KSM-66 90-capsule bottle provides 600 mg of organic ashwagandha root extract per vegetarian capsule. It is not a proven anxiety medicine, and ashwagandha is not suitable for everyone.

Avoid ashwagandha during pregnancy or breastfeeding; NCCIH also does not recommend it for people with thyroid or autoimmune disorders. Check with a clinician before use if you have surgery planned or take medicines, especially blood pressure, diabetes, thyroid, sedative, antiseizure or immunosuppressant drugs. Stomach upset and drowsiness can occur, and rare liver injury has been reported. Stop taking it and seek prompt medical care if you develop yellow skin or eyes, dark urine, or feel severely ill. Safety beyond about three months is uncertain.

Format: Vegan capsule
Review basis: Label-based analysis

Supplement Explained Score64/100See the five reasons

Good fit

Comparing a specifically identified root extract after screening pregnancy, thyroid, liver and medicine concerns.

Consider another option

Pregnancy or breastfeeding, a relevant thyroid/autoimmune condition, or expecting a risk-free daily anxiety treatment.

The product, at a glance

The reviewed package and label.

Label serving: 1 capsule
Declared amount: Organic KSM-66 ashwagandha root extract 600 mg; checked page does not state a withanolide percentage
Reviewed pack supply: 90 capsule servings

Published label sources checked October 15, 2026. Full formula and version limits are explained below.

On this page

What this formula contains
What the research supports
Price per capsule
Supplement Explained Score

What this formula contains

The NOW product page does not state a withanolide percentage. The 600 mg figure describes the weight of the root extract, not its withanolide content. Other listed ingredients are hypromellose, microcrystalline cellulose, ascorbyl palmitate and silica.

This is a different preparation from NOW's different 450 mg standardized formula. The milligram amounts alone do not tell you which delivers more withanolides. To match this exact product at a seller, look for NOW KSM-66, 600 mg, 90 vegetarian capsules and UPC 733739046338. Other brands' KSM-66 products, different bottle sizes and melatonin blends are separate products.

What the research supports

NCCIH's evidence summary says some ashwagandha preparations may help with stress and insomnia, but studies are often small and limited. Those findings concern particular preparations; they are not results from a clinical trial of this finished NOW retail bottle.

The KSM-66 trademark identifies a branded extract. The name alone does not establish that an individual batch has been independently tested. For more on the herb's potential benefits and risks, see our ashwagandha guide.

Price per capsule

The matched HerbsPro listing was $18.41 for 90 capsules on October 15, 2026, before tax and shipping. That works out to about 20.5 cents per capsule. This is a per-capsule cost, not a confirmed daily cost: the bottle count alone does not establish a 90-day supply.

Our editorial assessment

Supplement Explained Score

64/100

Five equally weighted criteria. This is an editorial assessment, not customer stars or a measure of medical effectiveness.

Label clarity 4/5: Root source, extract name and 600 mg amount are stated, but the checked manufacturer page does not publish a withanolide percentage; the review does not invent one.
Research relevance 3/5: Some preparation-specific trials support stress/sleep outcomes, with limited small-study evidence. They do not verify this retail lot or establish treatment of an anxiety disorder.
Safety and cautions 2/5: Pregnancy/breastfeeding avoidance, thyroid/autoimmune cautions, multiple medicine interactions and rare liver-injury reports materially restrict routine suitability.
Testing and quality checks 3/5: KSM-66 identifies a named extract, not independent finished-bottle potency or contaminant certification. No matching lot report was verified.
Value for money 4/5: The $18.41/90 offer is about $0.205 per capsule and has a simple one-capsule label serving; low price does not remove the clinical cautions.

Based on published labels and the sources in this review. We did not buy, personally use or laboratory-test this product. Limited testing documentation is not evidence of contamination.

Assessment: 2026-10-15. How we assign points.

Sources behind this score

Sources

Sources and labels checked October 15, 2026. How we review. General information, not personal medical advice.

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