Nutricost KSM-66 Ashwagandha Root Extract 600mg
- Ashwagandha
- Capsule
- 60
- Gluten Free
- More reviewed than 86%
A standardized, high-demand KSM-66 ashwagandha with an absorption aid built in, though the milk allergen flag is worth a second look.
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How it ranks among the 84 ashwagandha we track
4.6★ across 4,002 Amazon ratings, Bayesian-smoothed toward the category average.
4,002 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
20,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 84 ashwagandha we track - how the scorecard works · full ashwagandha data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
Nutricost's KSM-66 Ashwagandha delivers 600 mg of root extract standardized to 5% withanolides per capsule, paired with BioPerine, in a 60 count veggie cap bottle. It holds a 4.6 star rating and sold about 20,000 units in the past month.
KSM-66 is a specific, patented ashwagandha extraction method, and pairing it with BioPerine, a black pepper extract used to aid absorption, is a common formulation choice in this category. The listing flags milk as an allergen despite the gluten free claim, worth checking for anyone with a dairy sensitivity even though the capsules are veggie based. Purchase volume here is notably high relative to most items in this batch.
- 600 mg KSM-66 ashwagandha per cap
- 5% withanolides standardized
- 60 veggie capsules
- BioPerine added
Who it's for
Aimed at people specifically seeking KSM-66 branded ashwagandha rather than a generic root extract, and comfortable with a 60 day bottle at one capsule daily. Not the choice for someone who needs a dairy-free guarantee, given the milk allergen note on the label.
Strengths and trade-offs
Drawn from this product's published specifications.
- Standardized to 5% withanolides
- BioPerine included for absorption
- Veggie capsules, gluten free
- High recent purchase volume
- Milk listed as an allergen
- 60 day supply at one cap daily
Performance notes
Standardizing to 5% withanolides gives a consistent active-compound level from bottle to bottle, which is the main variable in ashwagandha quality. Adding BioPerine is intended to improve absorption of co-ingested compounds, a common but not universally proven pairing in supplement formulation.
Specifications
| Brand | Nutricost |
|---|---|
| Model | NC-KSM66-60C |
| Form | Capsule |
| Count | 60 |
| Flavor | Flavor Is Not Applicable To This Product |
| Diet | Gluten Free |
| Allergens | Milk |
Other Nutricost ashwagandha
How it compares
This product against the closest alternatives we track in ashwagandha.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Nutricost KSM-66 Ashwagandha Root Extract 600mgThis product | 4.6 / 5 | 4,002 | 4.4 / 5 |
| Himalaya Organic Ashwagandha RootHimalaya | 4.6 / 5 | 13,118 | 4.6 / 5 |
| Youtheory AshwagandhaYoutheory | 4.7 / 5 | 5,747 | 4.6 / 5 |
| Gaia Herbs Ashwagandha Root 350 mgGaia | 4.6 / 5 | 6,942 | 4.5 / 5 |
| Bronson Ashwagandha Extra Strength Stress & Mood Support with BioPerineBronson | 4.6 / 5 | 6,809 | 4.5 / 5 |
Similar ashwagandha from other brands
Questions about the Nutricost NC-KSM66-60C
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is KSM-66 in Nutricost's ashwagandha?
KSM-66 is the specific root extract used, standardized to 5% withanolides at 600 mg per capsule.
Does Nutricost's KSM-66 Ashwagandha contain dairy?
The listing notes milk as an allergen, so it is not a guaranteed dairy-free product despite the gluten free label.
How many capsules are in the Nutricost KSM-66 bottle?
The bottle holds 60 veggie capsules.