Nutricost KSM-66 Ashwagandha Extract with Black Pepper Extract Capsules
Authorized Reseller
Packaging & appearance may differ
Photos are for general reference — the product description is the source of truth for exactly what you'll receive, so it's worth a quick read before ordering. Packaging, labeling, and appearance may vary from the images, and these cosmetic differences fall outside returns and refunds. If anything else about your order needs attention, our team is always happy to help.
Clinically studied stress support.
Backed by 22+ human trials.
Nutricost KSM-66 Ashwagandha delivers 600mg of the most researched ashwagandha extract per capsule — the same full-spectrum root extract used across over 22 peer-reviewed clinical studies.
- 600mg KSM-66 per capsule — the clinically studied dosage, not a diluted extract
- Adaptogen support — helps the body manage stress and supports healthy cortisol balance
- Energy and mental clarity — supports sustained focus without stimulants
- Sleep quality — ashwagandha has been studied for its role in supporting restful sleep
- Athletic performance and recovery — supports muscle strength and post-workout recovery
The gold standard extract,
enhanced for absorption.
KSM-66 is a patented, full-spectrum ashwagandha root extract produced using a proprietary process that preserves all the natural constituents of the herb. It is the only ashwagandha extract produced using a "green chemistry" approach with no alcohol or chemical solvents.
Each capsule also contains Black Pepper Extract (BioPerine) — a clinically validated bioavailability enhancer. BioPerine has been shown to increase the absorption of nutrients, ensuring more of each dose reaches your system.
- Full-spectrum root extract — not a leaf-stem blend; root only for maximum potency
- KSM-66 certified — verified withanolide content, batch tested
- BioPerine enhanced — added black pepper extract for improved bioavailability
- Vegan capsules — Non-GMO, no artificial flavors or colors
KSM-66 Certified
Full-spectrum ashwagandha root extract with standardized withanolide content. The most researched form available, with 22+ published human clinical trials.
BioPerine Enhanced
Black Pepper Extract (BioPerine) included in each capsule to increase bioavailability — so you absorb more of what you take.
Clinically Studied
KSM-66 is backed by rigorous independent research across stress, cognition, sleep, and athletic performance — not just traditional use.
What's Included
Each bottle contains 60 capsules of Nutricost KSM-66 Ashwagandha Extract with Black Pepper Extract. The single-bottle option provides a standard supply for personal use. The case option contains 12 bottles and is suited for ongoing use or for practitioners.
- 60 vegetarian capsules per bottle
- 600mg KSM-66 Ashwagandha Root Extract per capsule
- Black Pepper Extract (BioPerine) included per serving
- No artificial flavors, colors, or preservatives
- Non-GMO
FSA/HSA Eligible?
Dietary supplements, including ashwagandha capsules, are generally not eligible for reimbursement under Flexible Spending Accounts (FSA) or Health Savings Accounts (HSA) unless accompanied by a Letter of Medical Necessity (LMN) from a qualified healthcare provider. Eligibility rules vary by plan administrator.
We recommend confirming with your plan administrator before submitting a claim for this product.
Frequently Asked Questions
- What is ashwagandha?
- Ashwagandha (Withania somnifera) is an adaptogenic herb used in Ayurvedic medicine for centuries. Adaptogens are compounds that help the body respond to physical and mental stressors. KSM-66 is a specific patented extract of ashwagandha root with standardized active compounds (withanolides).
- How long before I feel results?
- Clinical studies on KSM-66 typically show measurable effects after 4–8 weeks of consistent daily use. Stress and cortisol-related outcomes tend to be observed at the 8-week mark in most published trials.
- Can I take this with other supplements?
- Ashwagandha is generally well-tolerated alongside most supplements. However, if you are taking medications — particularly for thyroid, blood pressure, immunosuppression, or sedatives — consult your healthcare provider before adding ashwagandha to your routine.
- What is the best time to take it?
- There is no universally established best time. Many users take ashwagandha with a meal to reduce the chance of digestive discomfort. Some prefer evening use to support sleep quality. Follow the label directions and consult a healthcare professional if unsure.
Why you should choose