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Head to head · Sleep & Stress

Nutricost KSM-66 Ashwagandha Root Extract 600 mg vs OLLY Sleep Gummies (Blackberry Zen)

Nutricost scores higher overall (8.1 vs 7.7 out of 10), mainly on efficacy and value. OLLY still leads on quality & purity.

Updated September 2026 from our full reviews · How we score

Higher score
Front of Nutricost KSM-66 Ashwagandha Root Extract 600 mg bottle, 60 capsules
NutricostKSM-66 Ashwagandha Root Extract 600 mg
8.1
Good

A full 600 mg daily dose of organic KSM-66 ashwagandha in one capsule for about $0.25-$0.28 a day. Strong value; not for pregnancy or thyroid conditions.

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Front of OLLY Sleep Blackberry Zen gummies bottle, 50 count
OLLYSleep Gummies (Blackberry Zen)
7.7
Good

NSF-certified gummy with a sensible 3 mg melatonin dose, but its L-theanine (50 mg) and botanicals are well below the amounts used in research.

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The short answer

Choose Nutricost if…

  • Budget-conscious buyers
  • Stress-related sleep trouble
  • People who want a single daily capsule
  • You care most about efficacy, value
  • You want the lower cost per serving ($0.28)

Choose OLLY if…

  • People who prefer a gummy to a pill
  • Shoppers who want NSF-certified label accuracy
  • Occasional sleeplessness and travel
  • You care most about quality & purity

Side by side

KSM-66 Ashwagandha Root Extract 600 mgSleep Gummies (Blackberry Zen)
Our score8.1 / 107.7 / 10
Efficacy (30%)7.87.0
Quality & Purity (25%)7.48.6
Value (20%)9.06.8
Experience (15%)8.28.2
Transparency (10%)8.58.3
FormCapsuleGummy
Serving1 capsule60 servings per container2 gummies25 servings per container
Price per serving$0.28$0.56
Testing & certifications
cGMP facilityThird-party tested
NSF Contents Certified
DietaryVegetarian, Gluten-free, Non-GMOGluten-free
Key ingredients
  • Organic KSM-66 ashwagandha root extract600 mg
  • BioPerine black pepper extract5 mg
  • Melatonin3 mg
  • L-theanine50 mg
  • Chamomile, passionflower and lemon balm extracts17 mg, 17 mg, 16 mg
Flavors—2 (Blackberry Zen, Strawberry Sunset)
Creator video reviews35

Pros and cons

KSM-66 Ashwagandha Root Extract 600 mg

  • 600 mg KSM-66 per capsule, the dose range where a meta-analysis found stronger sleep effects
  • About $0.25-$0.28 per daily serving
  • Label discloses standardization: at least 5% withanolides and under 0.1% withaferin A
  • Organic KSM-66 in a vegetarian capsule; non-GMO and gluten-free
  • Benefits build over weeks, and some buyers report no effect
  • Headaches reported by some buyers; not for pregnancy, with rare liver-injury reports and possible thyroid effects
  • No NSF, Informed Choice or similar product certification despite third-party testing claims

Sleep Gummies (Blackberry Zen)

  • 3 mg melatonin per serving, within the range sleep experts commonly suggest
  • Listed in NSF's certified dietary supplement database for label accuracy and contaminants
  • Every ingredient amount disclosed, with no proprietary blend
  • Buyers and TikTok reviewers consistently praise the blackberry flavor and easy chew
  • L-theanine (50 mg) and botanicals (16-17 mg each) are far below studied doses
  • About $0.56 per serving at the brand's list price, roughly five times a basic melatonin tablet
  • Some buyers report nausea or headaches, and buyers are split on value for money
  • Contains gelatin and 2 g added sugar per serving

Our verdicts

KSM-66 Ashwagandha Root Extract 600 mg

This is a no-frills, correctly dosed KSM-66 product at one of the lowest prices in the category, which makes it our value pick for ashwagandha. The evidence for stress and sleep is encouraging but modest, and the safety caveats around thyroid, liver and pregnancy are real, so it is best treated as an eight-week trial with a clinician's okay rather than a permanent staple.

Full review

Sleep Gummies (Blackberry Zen)

OLLY Sleep is a well-made, third-party certified melatonin gummy with a reasonable 3 mg dose, and most buyers find it pleasant and effective. The L-theanine and herbal extracts are too small to add much, so you are mainly paying for melatonin in a tasty, convenient form at several times the price of a basic tablet.

Full review

What creators say

Questions people ask

Is Nutricost better than OLLY?
In our scoring, Nutricost KSM-66 Ashwagandha Root Extract 600 mg rates higher overall (8.1 vs 7.7 out of 10). Nutricost leads on efficacy and value; OLLY leads on quality & purity. Scores weigh efficacy, quality, value, experience and transparency.
Which is cheaper per serving, Nutricost or OLLY?
Nutricost costs about $0.28 per serving versus $0.56 for OLLY, based on the list prices shown in our reviews. Prices change often, so check the current price before buying.
Are Nutricost and OLLY third-party tested?
Nutricost has no independent certification we could verify; OLLY carries NSF Contents Certified.
Who should choose Nutricost over OLLY?
Our reviews suggest Nutricost is best for budget-conscious buyers, stress-related sleep trouble and people who want a single daily capsule, while OLLY is best for people who prefer a gummy to a pill, shoppers who want NSF-certified label accuracy and occasional sleeplessness and travel.

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