Nutricost KSM-66 Ashwagandha Extract with Black Pepper Extract Capsules
Authorized Reseller
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