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#3 in Herbal Supplements Third-Party Tested

Youtheory Ashwagandha 1000mg

by Youtheory

"Costco-famous ashwagandha with 25,000+ reviews — KSM-66 extract for stress, sleep, and vitality"

Amazon Rating
4.5/5
Reviews
25,000+
Price Range
$14-18
Servings
60 servings
GMP Certified
Our Editorial Rating
8.6
Very Good
FormCapsule
SubcategoryAshwagandha
View on Amazon

Overview

Youtheory Ashwagandha provides 1000mg of ashwagandha root extract per serving, including KSM-66 — the most clinically studied ashwagandha extract in the world. Youtheory has become one of the best-selling supplement brands at Costco, and their ashwagandha is frequently the top-selling adaptogen on Amazon. KSM-66 has been validated in over 24 clinical trials for reducing cortisol, improving sleep quality, enhancing athletic performance, and supporting sexual health. The 60-capsule count at under $18 provides excellent value for a KSM-66 product.

Key Ingredients

IngredientAmount
Ashwagandha Root Extract (KSM-66)1000 mg

Pros & Cons

What We Like

  • KSM-66 (most studied ashwagandha extract)
  • 25,000+ Amazon reviews
  • Available at Costco
  • 1000mg per serving
  • Affordable for KSM-66

What Could Be Better

  • 2 capsules per serving
  • May cause drowsiness in some
  • Not suitable for thyroid conditions (consult doctor)
  • Effects take 4-8 weeks to fully develop

Who Is This For?

Best For

  • Stress and cortisol reduction
  • Sleep quality improvement
  • Athletic performance support
  • Costco shoppers

Not Ideal For

  • Those with thyroid conditions
  • Pregnant or nursing women
  • Those on sedative medications

Our Verdict

8.6/10 — Very Good

Youtheory Ashwagandha delivers the gold-standard KSM-66 extract at a Costco-friendly price. The 24+ clinical trials behind KSM-66 make this one of the most evidence-based herbal supplements available. A daily staple for stress management and overall vitality.

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