60 servings · 60 capsules

KSM-66®
Ashwagandha.

★★★★★★★★★★ 4.9 18 ratings
£17.99£0.30 / serving
or £15.29 with Subscribe and save Save 15%
  • ✓600mg KSM-66® ashwagandha root extract, standardised to 5% withanolides, per capsule
  • ✓One capsule a day, 60 servings per pack
  • ✓Plant-based capsule shell, vegan friendly
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In stock. Order with express delivery and it arrives ·
★★★★★★★★★★ 4.9 · 18 ratingsRead all
14-day returnsGMP-certified facilitiesMade in the UKVegan friendly
ISO 22000 facility✳Full-spectrum root✳5% withanolides✳Employee owned · est. 2013✳
ISO 22000 facility✳Full-spectrum root✳5% withanolides✳Employee owned · est. 2013✳
The extract

Root extract, standardised.

KSM-66® is a root extract standardised to 5% withanolides.

600mg
KSM-66® per capsule
Root extract standardised to 5% withanolides.
Root
Full-spectrum
Made from the root of the plant.
0
Chemical solvents
Extracted without alcohol or any other chemical solvent.

600mg per capsule, one capsule per serving.

Transparent label

Inside the capsule.

One extract at a stated dose.

KSM-66®
600mg
Root extract
600mg KSM-66® ashwagandha root extract, standardised to 5% withanolides, per capsule.
Capsule
HPMC
Plant-based shell
Hydroxypropyl methylcellulose rather than gelatin, so the formula stays vegan friendly.
600mg
KSM-66®
Per capsule
5%
Withanolides
Standardised
60
Capsules
Per pack
60
Servings
One a day
Nothing hidden

The full label.

Every ingredient listed, with the dose on the label. Ingredients, allergens and nutrition for KSM-66® Ashwagandha, as printed on the pack.

Ingredients

KSM-66 Ashwagandha root extract, vegetable capsule shell (hydroxypropyl Methylcellulose), Flowing Agent (Magnesium Stearate), Anti-Caking Agent (Silicon Dioxide).

Allergen advice

No known allergens. Manufactured in a GMP Certified factory that handles fish, celery, soya, nuts, wheat and gluten.

VEGAN FRIENDLYGMP-CERTIFIED FACILITIESMADE IN THE UK
Nutritional information
Serving size 1 capsule · 60 servings
Per capsule
KSM-66 Ashwagandha root extract (Withania somnifera, standardised to 5% withanolides) 600 mg
Take one capsule with a small glass of water. Store in a cool, dark place with the lid replaced.
How to use

One capsule, every day.

Take one capsule with a small glass of water. Store in a cool, dark place with the lid replaced.

One capsule,

1
Capsule
Water
Small glass
Daily
Every day
Before bed
30–60 minutes before bedtime
Stack it
Pairs with ZMPRO
The Efectiv difference

How we compare.

EFECTIV KSM-66®
Other brands
Type
KSM-66® root extract
KSM-66 or other extracts
Potency
Standardised to 5% withanolides
Varies between products
Dose on the label
600mg per capsule
Varies

Comparison against leading UK ashwagandha capsules. Several also use KSM-66; extract type, standardisation and dose vary by product. Checked October 2026.

Verified reviews

What people say.

4.9 ★★★★★★★★★★
Based on 18 verified ratings

Verified KSM-66® Ashwagandha reviews from customers who bought it, collected by Lipscore. Good or bad, every review is published.

18
Verified ratings
via Lipscore
★★★★★
KSM-66® Full-Spectrum Root Extract, 60 Servings

All KSM-66® Ashwagandha reviews.

Collected & verified by Lipscore
On the label

Quality you can check.

KSM-66® Ashwagandha is made in the UK to ISO 22000 standards, with every active ingredient printed on the label with its dose.

Ingredients
Listed in full
Formula
Full dosages listed
Manufacturing
UK, ISO 22000
Label
Every dose listed
Harry Lightfoot
Our athletes
“I track calories. I consume 5,673 per day. This is on both training days and rest days.”
#1 UK Crossfit · Efectiv Athlete
18
Efectiv athletes
4.9
18 ratings
6
Sports backed
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Before you ask

Questions, answered.

KSM-66 is a premium, highly concentrated extract of ashwagandha root, designed to deliver consistent potency and high levels of active compounds.
KSM-66® is a root extract standardised to 5% withanolides, with 600mg in each capsule.
600mg KSM-66® ashwagandha root extract, standardised to 5% withanolides, per capsule.
KSM-66® Ashwagandha · 60 servings
Rated 4.9 out of 5 from 18 reviews