• 60 Servings
  • 60 Servings
All /KSM-66 Ashwagandha

KSM-66 Ashwagandha

KSM-66 Ashwagandha

High-potency, organic KSM-66® Ashwagandha capsules clinically shown to reduce stress, boost cognitive function, improve mood, and support hormonal balance.

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KSM-66 Ashwagandha

KSM-66 Ashwagandha

Third-Party Testing

We believe trust is earned through transparency. That’s why we provide full access to our third-party test results, so you can feel confident in what you’re taking. View all third-party tests.

View product purity test results (Certificate of Analysis)
 

Transparent Labs KSM-66® capsules are the perfect option if you're after a high-quality, organic, and standardized Ashwagandha (Withania somnifera) extract.


Each capsule provides the clinically studied dose of 600 mg KSM-66®, which is the most extensively studied ashwagandha extract available, standardized to contain 5% bioactive withanolides.


Ashwagandha is arguably the most versatile adaptogenic herb known to man. Its multifunctional benefits are the subject of ongoing research, with studies thus far showing that it controls stress and anxiety, eases inflammation and fights oxidative stress, improves mood and mental performance, promotes healthy metabolic, endocrine, and immune function, and supports sexual function.

 
 

Orders in the US over $99 ship free.

Once your order has shipped out from our fulfillment center, you will receive a Shipping Confirmation email. If you selected a tracked shipping method, you will receive your tracking information, along with the necessary steps to track your order, within this email. Please note, orders are generally fulfilled same day or next business day.

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45 Day Satisfaction Guarantee

If you are not satisfied with your product, we will offer you a full refund or store credit for the value of the item within 45 days of delivery.

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Why Use KSM-66 Ashwagandha

Transparent Labs KSM-66® Ashwagandha is a root extract standardized for 5% withanolides to support stress relief, cognition, hormonal health, and vitality.

Reduces Stress & Anxiety

Lowers cortisol to support stress management, promoting relaxation, emotional stability, and mental clarity.

Enhances Cognitive Function

Clinically shown to improve cognitive performance, focus, and overall mental well-being.

Supports Healthy Hormones

Naturally balances cortisol and testosterone, promoting vitality, mood, and sexual function.

Organic & Clinically Validated

Contains standardized, organic ashwagandha root extract with third-party tested purity and potency.

Key Ingredients

Our formulas are made with clean, natural ingredients, with clinically-validated dosages to support health and performance.

KSM-66® Ashwagandha (Withania somnifera Root Extract)

600 mg
A clinically validated, organic adaptogen that reduces cortisol, supports cognition, mood, hormonal balance, muscle recovery, and resilience to physical and mental stress.

KSM-66® Ashwagandha (Withania somnifera Root Extract)

600 mg

Each batch of KSM-66® ashwagandha extract is standardized to contain 5% withanolides, the primary bioactive constituents in the herb [1]. This specific ashwagandha root extract (KSM-66®) has been clinically evaluated in 24 human studies, a feat that no other ashwagandha extracts have matched [2]. The findings of these studies demonstrate the compelling benefits of KSM-66® for human health and longevity, especially concerning anxiety, chronic stress, sex hormone production, body weight management, and cognitive functions/mental clarity. 

Ashwagandha (Withania somnifera), also known as Indian ginseng, is arguably the most versatile adaptogenic herb known to man. Adaptogenic herbs are so-named because they help the body adapt to and overcome physical and mental stress through diverse mechanisms, such as modulating stress hormone production (e.g., lowering cortisol levels) and attenuating inflammation.

Several recent research reviews comprising preclinical and clinical trials suggest that the health benefits of ashwagandha extract include [3,4]:

  • Controlling stress hormones (e.g., cortisol) and fighting anxiety 
  • Easing inflammation and oxidative stress
  • Enhancing mood and mental performance
  • Promoting healthy metabolic, endocrine, and immune function
  • Supporting blood glucose balance and insulin sensitivity
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Complete Your Stack

Pair KSM-66 Ashwagandha with these products for a complete foundational stack.

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Every Ingredient Matters to Make Every Effort Count

Shop Clean Supplements
  • Am able to sleep all night for the last couple months.
  • I feel at ease; my anxiety is pretty much in control.
  • My sleep is better, mood has stabilized, and my workout improved!
  • 5 stars: 109 (90%)
  • 4 stars: 4 (3%)
  • 3 stars: 6 (5%)
  • 2 stars: 2 (2%)
  • 1 star: 0 (0%)
M
Mayra Z.
Reduced percived stress

Ordered on September 1, delivered on September 10. Today is September 21, and I have been taking 600 mg (1-2 capsules per day) as instructed.

During the first three days, I felt quite sleepy. After 10 days of consistent use, I’ve noticed a significant reduction in perceived stress, even in stressful situations.

For example, today I was subbing for a class, and several students were refusing to do their work. When I approached them and asked if they had started or completed the assignment, some initially ignored me, which I might have taken personally before. However, I’ve been able to stay more empathetic and patient, leading to a complete change in their behavior. By slowing down, staying present, and explaining my intentions clearly, I turned what could have been a negative experience into a positive one by showing that I genuinely care.

Another instance was with my sister, who said things out of frustration when her ego wouldn’t allow her to apologize. Normally, I might have taken it as a personal attack and escalated the situation, but instead, I stayed calm and responded thoughtfully without getting upset like she did.

Overall, I feel like these supplements have helped me stay grounded and less reactive in stressful moments.

Mayra Z. review photo
K
Kevin S.
60 Servings
AWESOME

AWESOME ‼️

T
Terry C.
60 Servings
Has become a regular part of my night time sleep

Has become a regular part of my night time sleep regimen. Am able to sleep all night for the last couple months. For the previous close to 20 years I normally woke at 2 or 3 and was up for a couple hours. I credit the cortisol control by KSM-66 for at least part of my return to normal sleep hours.

D
Douglas

Trying this supplement out

B
Breann

I just love this stuff!

A
Anonymous
60 Servings
Definitely helps

Definitely helps keep my menopausal hormonal issues regulated!

M
Mark

Always quality from Transparent Labs!
My Protein and Creatine go to!!

A
Andy

Good

E
E.B.

Great stuff

A
Alba

Me gusto mucho gracias luego mas adelante pienso volver a comprar

J
J.W.

This works!!!

D
Diego

Very nice

J
Joseph

Great product works well thank you

J
JOSE R.M.
60 Servings
excelente

excelente producto

A
Anonymous
60 Servings
KSM 66

Quick delivery and was highly rated for quality

E
Erik

Solid product at a very competitive price. Outstanding customer service from a great company! Source your supplements here without question or concerns.

B
Brian R.

Great vitamins. Have ordered a few times and have been happy with the results.

S
S.N.M.

Love it

L
Luke

Very fast. Was 3 days early

T
Tomas

Its working well

G
Garcia

Received my order prompt.

Э
Э.Э.

Best ashwa in the world

R
Robert

Super clean. Tier 1 ingredients.

M
M.D.

Sleeping better. I Feel more relaxed

S
S.M.

As advertised

A
AB

Seems like a good product.

F
F.G.

Good

A
AB
60 Servings
Quick shipping

No idea if it really works or it’s another fad. Time will tell.

K
Kel
Good products

I am new to these products and so far loving everything I have tried

J
Jonathan S.
Sun or supplement

Not sure if it was the spring sun or this supplement but after two weeks things have felt on an even keel.

D
Dfletch

Great product

A
Alannah E.
Great Product

I love transparent labs for their clean supplements, this ashwagahda has helped me immensely with stress. Shipping was, as always, prompt.

How To Use

1

Step 1 – Take 1 Capsule Daily

Consume one capsule daily with water, with or without food.
 
2

Step 2 – Optimal Consistency

Use consistently for at least 3-4 weeks to experience maximum stress reduction and cognitive benefits.

Disclaimer: Consult your physician if pregnant, nursing, or taking medications, especially thyroid medications.

Frequently Asked Questions

KSM-66 Ashwagandha is a patented, full-spectrum extract made from the ashwagandha root. It delivers consistent levels of bioactive withanolides and is clinically studied for stress, sleep, mood, cognitive performance, and physical endurance.

 

KSM-66 helps lower stress and cortisol, supports better sleep quality, improves mood and cognitive clarity, and enhances strength, recovery, and endurance. It is the most researched ashwagandha extract for overall well-being.

 

Generic ashwagandha varies in potency and may include leaf extract. KSM-66 is a root-only, standardized extract with clinically validated levels of active compounds, offering stronger consistency and more reliable research-backed benefits.

 

Yes. Most clinical trials show the greatest benefits when KSM-66 is taken daily for 8–12 weeks. Regular use supports stress management, sleep, energy, and mental performance.

 

Most studies use 300–600 mg per day for stress, mood, and cognitive benefits. Transparent Labs provides a clinically dosed amount aligned with research recommendations.

 

KSM-66 is well-tolerated for most users. Mild side effects may include digestive upset or drowsiness. Those who are pregnant, have thyroid conditions, or take medications should consult a healthcare provider before use.

What is KSM-66® Ashwagandha?

KSM-66 Ashwagandha is a patented, full-spectrum extract made from the ashwagandha root. It delivers consistent levels of bioactive withanolides and is clinically studied for stress, sleep, mood, cognitive performance, and physical endurance.

What does KSM-66® Ashwagandha do?

KSM-66 helps lower stress and cortisol, supports better sleep quality, improves mood and cognitive clarity, and enhances strength, recovery, and endurance. It is the most researched ashwagandha extract for overall well-being.

What is the difference between Ashwagandha and KSM-66®?

Generic ashwagandha varies in potency and may include leaf extract. KSM-66 is a root-only, standardized extract with clinically validated levels of active compounds, offering stronger consistency and more reliable research-backed benefits.

Can you take KSM-66® Ashwagandha every day?

Yes. Most clinical trials show the greatest benefits when KSM-66 is taken daily for 8–12 weeks. Regular use supports stress management, sleep, energy, and mental performance.

What is the best dosage for KSM-66® Ashwagandha?

Most studies use 300–600 mg per day for stress, mood, and cognitive benefits. Transparent Labs provides a clinically dosed amount aligned with research recommendations.

What are the side effects or disadvantages of KSM-66® Ashwagandha?

KSM-66 is well-tolerated for most users. Mild side effects may include digestive upset or drowsiness. Those who are pregnant, have thyroid conditions, or take medications should consult a healthcare provider before use.