Ashwagandha
Nootropic4 forms compared ↓
Also known as: Withania somnifera, Indian ginseng, Ashwagandha (Thyroid Support), Ashwagandha Extract (Withania somnifera), Winter cherry
A
Grade A💊 300-600 mg daily (KSM-66/Sensoril)🎯 12 primary uses🔗 3 synergies⚠️ Review warnings
Levels upBrain & Focus+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 formsDifferent chemical forms vary in absorption, side effects, and best use cases. Higher bioavailability scores indicate better absorption.
KSM-66 (Root Extract)
HIGH 100Root-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 90Root + 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 95Highest-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 60Non-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
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
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.
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
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
Tags
adaptogenanxietystresstestosteronestrengthfertilitythyroidhypothyroidtshanxiolyticcortisol supporttraditionalstandardized
Top Products with Ashwagandha
Highest-scored catalog products containing Ashwagandha, ranked by our scoring engine.
Ashwagandha Extract PowderNootropics Depot93
Ashwagandha Extract TabletsNootropics Depot93
Ashwagandha Root CapsulesNutricost93
Thyroid Health Complex (formerly Thyrocsin)Thorne90
Related Guides
In-depth guides covering Ashwagandha — protocols, comparisons, and use cases.
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Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, September). 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.