Ashwagandha

Nootropic4 forms compared ↓

Also known as: Withania somnifera, Indian ginseng, Ashwagandha (Thyroid Support), Ashwagandha Extract (Withania somnifera), Winter cherry

Grade A

💊 300-600 mg daily (KSM-66/Sensoril)🎯 12 primary uses🔗 3 synergies⚠️ Review warnings

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Levels upCognition+50 pts

Overview

Ashwagandha is a traditional Ayurvedic herb standardized for withanolides, with evidence supporting modest benefits for stress reduction, anxiety, and cortisol modulation. Multiple clinical trials demonstrate efficacy for stress-related symptoms, though effect sizes are generally moderate.

Primary Uses

Stress/anxietyCortisol reductionSleepTestosterone supportStrength gainsFertilitySubclinical hypothyroidismTSH normalizationThyroid supportStress and anxiety reductionCortisol managementSleep quality support

Frequently Asked About Ashwagandha

How much Ashwagandha should I take?

The typical effective range is 600 mg KSM-66 daily. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.

When is the best time to take Ashwagandha?

Evening often best for sleep. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.

Should I take Ashwagandha with food?

Optional.

What is the best form of Ashwagandha?

KSM-66 (Root Extract) is generally the best-absorbed form (Root-only extract standardized to ≥5% withanolides; the most-studied branded form). Cheaper forms exist but often deliver less usable Ashwagandha per dose.

Does Ashwagandha interact with medications?

Yes — known interactions include Thyroid meds, Sedatives, and Immunosuppressants. If you take any prescription medication, talk to your doctor or pharmacist before starting Ashwagandha.

What does Ashwagandha pair well with?

Ashwagandha stacks well with Rhodiola, Magnesium, and L-theanine — these combinations either improve absorption or work synergistically toward common goals.

Who should not take Ashwagandha?

Ashwagandha should be avoided or used with caution by people with Hyperthyroidism and Nightshade sensitivity. Pregnant or breastfeeding women should consult a healthcare provider before use.

Compare Forms

4 forms

Different chemical forms vary in absorption, side effects, and best use cases. Higher bioavailability scores indicate better absorption.

KSM-66 (Root Extract)

HIGH 100

Root-only extract standardized to ≥5% withanolides; the most-studied branded form

Best for:Stress/cortisol reductionStrength and recoveryTestosterone supportGeneral use

💡 Well-absorbed. Largest evidence base of any extract: 24+ human trials.

✅ Pros

• Most clinical data
• Energizing during day
• Strength + cortisol benefits
• Root-only (traditional)

⚠️ Cons

• More expensive than generic
• Standard 600 mg dose

📝 Default choice. Ixoreal Biomed's branded extract.

Sensoril (Root + Leaf)

HIGH 90

Root + leaf extract with ≥10% withanolides — higher potency, calming profile

Best for:AnxietySleep supportCortisol-driven insomnia

💡 Higher withanolide content per mg. Effective at 125-250 mg.

✅ Pros

• More calming than KSM-66
• Lower effective dose
• Sleep evidence

⚠️ Cons

• Can be sedating during day
• Includes leaf (some traditions exclude)

📝 Better for evening/sleep use than KSM-66. Natreon's branded extract.

Shoden (Root + Leaf, 35% Withanolide Glycosides)

HIGH 95

Highest-potency standardized extract — 35% withanolide glycosides

Best for:Lower-dose protocolsSleep qualitySensitive users

💡 Very high concentration allows 120 mg to match higher doses of other forms.

✅ Pros

• Lowest effective dose
• Strong sleep data
• Premium quality control

⚠️ Cons

• Most expensive per mg
• Newer brand, less long-term data

📝 Excellent for sleep. Arjuna Natural's branded extract.

Generic Ashwagandha Powder/Extract

GOOD 60

Non-standardized root powder or low-strength extract

Best for:Budget option onlyTraditional preparations

💡 Variable. Withanolide content often unverified.

✅ Pros

• Cheapest
• Traditional whole-root form

⚠️ Cons

• No potency guarantee
• Heavy metal contamination risk
• May not work

📝 Skip unless lab-tested. Pay for a branded standardized extract.

Dosage

Typical range

300-600 mg daily (KSM-66/Sensoril)

Timing

Evening often best for sleep

With food

Optional

Dose Tiers

Moderate

300-600 mg KSM-66

Optimal

600 mg KSM-66 daily

Therapeutic

125-250 mg Sensoril or 120 mg Shoden

Upper Limit

No established UL

Duration

Benefits build over weeks

Special Populations

Anxiety, stress, low testosterone

Research & Studies

Landmark clinical studies on Ashwagandha. Each title links to a plain-English breakdown — what the study shows, what its limitations are, and how to read around them.

A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults
Chandrasekhar K, Kapoor J, Anishetty S · 2012 · Indian Journal of Psychological MedicineRCTPubMed ↗
60-day double-blind RCT (n=64) using 300mg KSM-66 ashwagandha twice daily significantly reduced perceived stress (PSS) and serum cortisol vs placebo.
An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract
Salve J, Pate S, Debnath K, Langade D · 2019 · CureusRCTPubMed ↗
8-week RCT (n=60) showed ashwagandha 250mg and 600mg daily significantly reduced perceived stress, serum cortisol, and improved sleep quality vs placebo, with greater effect at the higher dose.

PubMed (RCTs) ↗Randomized trials PubMed (all) ↗Full literature Cochrane Reviews ↗Systematic reviews Examine.com ↗Research summaries

Browse all curated studies →

Mechanism of Action

• GABAergic activity
• Cortisol reduction
• Thyroid hormone support

Evidence Quality

Evidence Grade A

Best-studied adaptogen for anxiety

Safety & Contraindications

Serious Warnings

• May affect thyroid

Contraindications

• Hyperthyroidism
• Nightshade sensitivity

Common Side Effects

• Drowsiness
• GI upset
• Headache

Pregnancy & Breastfeeding

Avoid

Liver & Kidney Notes

Safe

Interactions

💊 Medications

• Thyroid meds
• Sedatives
• Immunosuppressants

🧪 Supplements

• Works with Rhodiola

🍽️ Food & Alcohol

• No interactions

Stacking & Synergies

Pairs Well With

Rhodiola ↗Magnesium ↗L-theanine ↗

Avoid Combining With

May be too calming with sedatives

Best Goal Synergies

AnxietyCortisolSleep

Buying Guide

What to Look For

• Branded extracts

Standardization Markers

Withanolides %KSM-66 or Sensoril

Adulteration risk

Moderate

Practical Notes

• KSM-66 most studied
• Can affect thyroid - monitor if on meds
• 8 weeks for effects
• May increase thyroid hormones
• Monitor if on thyroid medication
• Study-backed extracts preferred

Top Products with Ashwagandha

Highest-scored catalog products containing Ashwagandha, ranked by our scoring engine.

Browse all Ashwagandha products →

Related Guides

In-depth guides covering Ashwagandha — protocols, comparisons, and use cases.

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Last reviewed: June 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.

Cite this page

Formulate Research Team. (2026, June). Ashwagandha — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/ashwagandha

Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.