# KSM-66 (Ashwagandha Root Extract)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/ksm-66-ashwagandha-root-extract
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 8 / 10
**Category:** Adaptogen
**Also Known As:** Withania somnifera, Winter Cherry, Indian Ginseng, Poison Gooseberry, Asgandh, Samm Al Ferakh, Ajagandha, Clustered Wintercherry

## Overview

KSM-66 is a concentrated root extract of Withania somnifera containing high levels of withanolides, the primary bioactive compounds. It works by modulating the [hypothalamic-pituitary-adrenal](/ingredients/condition/stress) (HPA) axis to reduce cortisol production and enhance stress adaptation.

## Health Benefits

- Reduces stress and anxiety: KSM-66 lowers cortisol levels by up to 28%, promoting a calmer state of mind. This leads to improved mental well-being and [stress resilience](/ingredients/condition/stress). - Enhances athletic performance: It boosts strength and endurance, increasing muscle mass and recovery rates. This supports athletes in achieving peak performance. - Improves sexual health: KSM-66 enhances libido and sexual function by balancing hormones. This leads to a more satisfying and healthy sexual life. - Supports [cognitive function](/ingredients/condition/cognitive): It improves memory and focus, enhancing cognitive abilities and reducing the risk of cognitive decline. This helps maintain mental sharpness. - Boosts energy and vitality: By enhancing [mitochondrial function](/ingredients/condition/energy), it increases energy levels and reduces fatigue. This supports a more active and vibrant lifestyle. - Promotes restful sleep: KSM-66 improves [sleep quality](/ingredients/condition/sleep) by regulating sleep cycles, leading to more restorative rest. This enhances overall well-being and daytime alertness. - Supports immune health: It strengthens the [immune system](/ingredients/condition/immune-support) by modulating immune responses, reducing the risk of infections. This leads to a more robust defense against illnesses.

## Mechanism of Action

KSM-66's withanolides, particularly withanoside IV and withanoside VI, regulate the [HPA axis](/ingredients/condition/stress) by inhibiting cortisol synthesis and modulating GABA-A receptors. The extract enhances nitric oxide production and increases [testosterone levels](/ingredients/condition/hormonal) by stimulating luteinizing hormone release. Withanolides also activate AMPK pathways, improving cellular [energy metabolism](/ingredients/condition/energy) and muscle protein synthesis.

## Clinical Summary

Multiple randomized controlled trials with 300-600mg daily doses show significant stress reduction and performance benefits. A 60-day study (n=64) demonstrated 27.9% [cortisol reduction](/ingredients/condition/stress) compared to placebo. Strength studies (n=57) showed 15% greater bench press increases and 17% larger quadriceps growth. Evidence quality is moderate with most studies lasting 8-12 weeks in healthy adults.

## Nutritional Profile

{"macronutrients": {"protein": "Approximately 4-5% by weight", "fiber": "Approximately 2-3% by weight"}, "micronutrients": {"iron": "0.2-0.3 mg per gram", "calcium": "0.1-0.2 mg per gram", "vitamin C": "Trace amounts"}, "bioactive_compounds": {"withanolides": "5% by weight", "alkaloids": "Trace amounts", "saponins": "Trace amounts"}, "bioavailability_notes": "The bioavailability of withanolides is enhanced when consumed with fats. The presence of piperine (from black pepper) can also enhance absorption."}

## Dosage & Preparation

The typical dosage for KSM-66 ranges from 300 to 600 milligrams per day. Consult a healthcare provider before use.

## Safety & Drug Interactions

KSM-66 is generally well-tolerated with mild side effects including drowsiness and stomach upset in some users. It may enhance effects of sedative medications and interact with immunosuppressants due to immune-modulating properties. Contraindicated in pregnancy, breastfeeding, and autoimmune conditions like rheumatoid arthritis. May lower blood sugar, requiring monitoring in diabetics taking glucose-lowering medications.

## Scientific Research

KSM-66 has been the subject of numerous clinical studies, including RCTs, which have demonstrated its effectiveness in reducing stress and improving [cognitive](/ingredients/condition/cognitive) and [physical performance](/ingredients/condition/energy).

## Historical & Cultural Context

Ashwagandha has been used in Ayurvedic medicine for centuries as a rejuvenating tonic and [adaptogen](/ingredients/condition/stress), helping the body adapt to stress and improve vitality.

## Synergistic Combinations

Rhodiola Rosea, Bacopa Monnieri, L-Theanine

## Frequently Asked Questions

### What is the recommended dose of KSM-66 ashwagandha?

The clinically studied dose of KSM-66 ranges from 300 to 600 mg per day. Most randomised controlled trials use 300 mg twice daily or 600 mg as a single dose. The appropriate amount depends on your specific goal — lower doses are often used for stress and sleep support, while athletic performance studies tend to use the higher end of the range. Always consult a healthcare provider before starting, particularly if you have existing health conditions or take medications.

### Can KSM-66 help reduce cortisol levels?

Yes. KSM-66 has been shown in clinical trials to reduce serum cortisol levels by up to 28%. Its withanolides work by modulating the hypothalamic-pituitary-adrenal (HPA) axis, inhibiting cortisol synthesis at the source. Lower cortisol translates to reduced physiological stress responses, improved mood, and better recovery. This cortisol-lowering effect is one of the most well-documented benefits of KSM-66 and underpins many of its downstream effects on sleep, body composition, and cognitive function.

### Does KSM-66 improve sleep quality?

Evidence suggests KSM-66 can meaningfully improve sleep quality. Its cortisol-reducing and GABA-A receptor-modulating mechanisms help calm the nervous system, making it easier to fall and stay asleep. Clinical studies have reported improvements in sleep onset, total sleep time, and sleep efficiency. By promoting more restorative sleep cycles, KSM-66 also supports daytime alertness and cognitive performance. It is not a sedative but rather works by addressing stress-related disruptions that commonly impair sleep.

### Can I take KSM-66 with antidepressants or anxiety medications?

KSM-66 interacts with GABA-A receptors and modulates the HPA axis, which overlap with mechanisms targeted by certain anxiolytics and antidepressants. Taking KSM-66 alongside benzodiazepines, SSRIs, or other CNS-active medications could potentially amplify sedative or mood-altering effects. While no widespread adverse interactions have been formally documented, combining them without medical supervision is not advised. Always disclose all supplements to your prescribing healthcare provider before use to avoid unintended pharmacological interactions.

### Does KSM-66 help with muscle growth and athletic performance?

Yes. KSM-66 supports athletic performance through multiple mechanisms: it activates AMPK pathways to improve cellular energy metabolism, stimulates muscle protein synthesis, and reduces exercise-induced cortisol spikes that can impair recovery. Clinical RCTs have reported significant improvements in muscle strength, endurance, and lean body mass in resistance-trained individuals taking 600 mg daily. Its testosterone-supporting effects via luteinizing hormone stimulation may further contribute to muscle-building outcomes over time.

### Is KSM-66 safe for women to take?

KSM-66 is generally considered safe for women and has been studied in female populations for benefits including stress reduction, cognitive support, and sexual health. Its hormone-modulating properties are primarily linked to cortisol reduction and HPA axis regulation, which are relevant to both sexes. However, ashwagandha is not recommended during pregnancy due to potential uterine-stimulating effects, and women with hormone-sensitive conditions should consult a healthcare provider before use.

### What makes KSM-66 different from other ashwagandha extracts?

KSM-66 is a full-spectrum root-only extract standardised to at least 5% withanolides, the primary bioactive compounds in Withania somnifera. Unlike extracts that use leaves or aerial parts, KSM-66 uses only the root, consistent with traditional Ayurvedic usage and associated safety data. Its proprietary extraction process avoids alcohol solvents, preserving a broad withanolide profile. This specificity means KSM-66's clinical trial data is not necessarily interchangeable with other ashwagandha products of differing standardisation or plant parts.

### Can KSM-66 help with brain fog and memory?

KSM-66 has shown promise for cognitive function in clinical research. Its withanolides, particularly withanoside IV and VI, support neuronal health and may reduce neuroinflammation. By lowering cortisol — which at chronically elevated levels impairs hippocampal function — KSM-66 indirectly protects memory and concentration. Studies have reported improvements in reaction time, attention, and working memory in adults supplementing with KSM-66. Enhanced mitochondrial function from AMPK activation may also contribute to greater mental energy and reduced brain fog.

### How long does KSM-66 take to work?

Most clinical studies on KSM-66 show meaningful effects after 8 to 12 weeks of consistent daily use. Cortisol reduction and stress relief may become noticeable within 4 weeks, as the HPA axis begins to recalibrate. Cognitive and athletic benefits typically require longer supplementation, reflecting cumulative adaptogenic effects. Because withanolides modulate receptor sensitivity and hormonal pathways gradually rather than acutely, KSM-66 is not a fast-acting compound. Daily consistency at 300–600 mg is key to achieving the outcomes demonstrated in randomised controlled trials.

### Does KSM-66 increase testosterone levels?

Yes, evidence suggests KSM-66 can support healthy testosterone levels in men. Its withanolides stimulate luteinizing hormone release from the pituitary gland, which signals the testes to produce more testosterone. Clinical trials in men with fertility concerns and in resistance-trained males have reported statistically significant increases in serum testosterone at doses of 300–600 mg daily. Additionally, by lowering cortisol—a hormone that competes with testosterone production—KSM-66 creates a more favourable anabolic hormonal environment, supporting libido, muscle mass, and overall vitality.

### What is the best time of day to take KSM-66?

KSM-66 can be taken once or twice daily depending on your goals. For stress and cortisol management, morning dosing aligns with the natural cortisol peak, helping blunt excessive stress responses throughout the day. For sleep support, an evening dose may leverage its GABA-A receptor modulation to promote relaxation before bed. When split into two 300 mg doses—morning and evening—users may benefit from both effects simultaneously. Taking KSM-66 with food is advisable to improve tolerability and potentially enhance absorption of fat-soluble withanolides.

### Can KSM-66 help with anxiety?

KSM-66 has demonstrated clinically meaningful reductions in anxiety scores in multiple RCTs. Its primary mechanism involves modulating GABA-A receptors—the same receptors targeted by anti-anxiety medications—producing a calming effect without sedation. Additionally, by suppressing cortisol synthesis via HPA axis regulation, KSM-66 reduces the physiological stress response that drives anxiety symptoms. Studies using validated tools such as the Hamilton Anxiety Rating Scale have reported significant improvements at 300–600 mg daily over 8–12 weeks. It is not a replacement for prescribed medication but may complement lifestyle-based anxiety management.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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