KSM-66
60 Capsules
Efectiv Nutrition Ashwagandha KSM-66 60 Caps — image 2 - 60 Caps
Efectiv Nutrition

Efectiv Nutrition Ashwagandha KSM-66 60 Caps

★★★★★
5.0 | 5 reviews |  60 Servings
£17.99 £0.30/serving
600mg KSM-66 600mg KSM-66 patented ashwagandha root - the form used in over 20 clinical trials.
Daily Capsule Root-only extract standardised to 5% withanolides - the active compounds in ashwagandha.
2 Month Supply 60 vegetarian capsules per bottle - two months of daily KSM-66 at around 30p a serving.
Size 60 Caps
Standard delivery
Next day (£5.99)
17,600+ Reviews
14-Day Returns
Est. 2005
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Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication, or under medical supervision, consult your doctor before use. Do not exceed the recommended daily intake. Store out of reach of children.

60 Caps

Efectiv KSM-66 Ashwagandha, 600mg Root Extract Standardised to 5% Withanolides

Efectiv Nutrition Ashwagandha KSM-66 is a single-ingredient adaptogen supplement in capsule form. Each capsule delivers 600mg KSM-66 Ashwagandha root extract. The 60-capsule bottle provides 60 single-capsule servings at one capsule daily.

KSM-66 is a full-spectrum, root-only ashwagandha extract produced via a green-chemistry process without alcohol or chemical solvents. It is the most clinically studied ashwagandha form, with over 24 peer-reviewed human trials supporting reductions in serum cortisol, subjective stress and anxiety scores, improvements in testosterone and muscle recovery in resistance-trained men, and enhancements in endurance and VO2max. Root-only extraction is significant because the root contains the primary active withanolide glycosides without the less characterised leaf alkaloids. At 600mg per capsule Efectiv uses the dose consistent with the clinical stress-reduction and performance studies.

What separates Efectiv KSM-66 from generic ashwagandha powder capsules is the extract standardisation. Generic ashwagandha products use unstandardised root powder with withanolide content that varies batch to batch and may be a fraction of that in KSM-66. The reproducibility and traceability of KSM-66 to clinical data is what justifies the premium over commodity ashwagandha.

Efectiv KSM-66 Ashwagandha suits athletes managing chronic training stress and cortisol elevation, men in heavy strength training blocks wanting to support testosterone baseline, and anyone prioritising recovery quality and stress resilience. It is not a pharmaceutical intervention for clinical anxiety disorders or documented hormonal deficiencies. Contains no major allergens.

Key Benefits

KSM-66 Patented

The world's most clinically studied ashwagandha extract with over 20 gold-standard trials proving efficacy for stress, cortisol, and performance.

Cortisol Reduction

Clinically proven to significantly reduce cortisol levels and perceived stress, helping you manage the demands of training and daily life.

Performance Support

Research shows KSM-66 enhances endurance, strength, muscle recovery rate, and cognitive function for both athletes and professionals.

100% Natural Extract

Full-spectrum root extract produced using green chemistry principles without alcohol or chemical solvents for maximum purity and bioavailability.

Frequently Asked Questions

What is KSM-66 and how is Efectiv KSM-66 different from generic ashwagandha?

KSM-66 is a branded ashwagandha root extract produced using a proprietary green-chemistry process without alcohol or chemical solvents. Efectiv KSM-66 is different from generic ashwagandha in two key ways. First, it is standardised to contain at least 5% withanolides, the key active compounds - many generic products use mixed whole-plant extracts with inconsistent withanolide content. Second, KSM-66 is the most clinically studied form of ashwagandha, with over 20 published human trials at the 600mg dose used in Efectiv KSM-66.

How long does Efectiv Ashwagandha take to support stress balance?

Most clinical studies on KSM-66 measured changes in cortisol and perceived stress markers after 4 to 8 weeks of daily use at 600mg. Ashwagandha is an adaptogen that works through consistent daily intake rather than providing an acute effect. Some people report subtle changes in sleep quality and calmness within the first two weeks, but fuller observed effects typically build over a longer period.

Can I take Efectiv Ashwagandha alongside creatine and protein supplements?

Yes. KSM-66 ashwagandha does not interfere with creatine, whey protein, pre-workouts or most other common sports supplements. It works through the stress and cortisol pathway, which is distinct from how performance supplements like creatine and protein work. Many people use ashwagandha as a daily wellness foundation alongside their training stack.