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Performance Fuel

product on market Capsule GNC SuperFoods Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 100% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · grounded in 1 source · methodology

KSM-66 Ashwagandha root extract is supported by moderate evidence for reducing stress and improving physical performance. Research suggests it may help modulate cortisol levels and enhance strength. The current evidence coverage for this specific profile is limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Performance Fuel
Open Full PDF View on NIH DSLD →
Details

Label Data

2 White Capsule(s)
Serving Size
Botanical
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Market median: 450.0mg (502 products) 28 studies (A:0, B:8)

Other Ingredients

Vegetable Cellulose Capsule Cellulose Dicalcium Phosphate Magnesium Stearate Silicon Dioxide Chlorophyll Stearic Acid
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Directions: As a dietary supplement, take the contents of one pack daily with food.

Warnings & Precautions

Keep out of reach of children.

Warning: Consult your physician prior to using this product if you are pregnant, nursing, taking medication, or have a medical condition.

Discontinue use two weeks prior to surgery.

Formulation Notes

No artificial colors, no artificial flavors, no artificial sweeteners, no wheat, gluten free, no soy, no dairy.

Vegetarian formula

Strength Features a clinically researched Ashwagandha extract shown to support increased strength and a healthy stress response.

Additional Information

Code 204011 AQG

Each pack contains:

Performance Fuel

Conforms to USP <2091> for weight. Meets USP <2040> disintegration.

{Capsule} Actual Size

Store in a cool, dry place.

When used in conjunction with a strength training regimen.

KSM-66(R) ashwagandha

GNC quality commitment For more than 79 years, GNC has been the leader in the development of superior nutritional supplements. Our products are produced using only fresh, high quality ingredients and are manufactured under the strictest quality controls.

GNC guarantee If you are not 100% completely satisfied, return the unused portion of the product with your receipt to a GNC store within 30 days. Our trained sales staff will either refund your purchase price or, if you prefer, assist you in finding a replacement product to help you LIVE WELL.

NEW!

Provides performance, strength, antioxidant and liver support

Gf GLUTEN FREE

V VEGETARIAN FORMULA

NON GMO

CLINICALLY RESEARCHED

Metadata

Product Details

DSLD Entry Date2015-08-25
Product TypeBotanical
FormCapsule
DSLD ID49202
Data Updated2026-04-11
Research

Research Evidence

63
Research Sources
54
Avg Quality
26
Systematic Review
21
Rct
11
Meta Analysis
5
Clinical Trial
B Identifying immunostimulatory herbal supplements that may flare autoimmune skin diseases: a systematic scoping review
Systematic Review Lupus science & medicine 2025 PubMed DOI
B Effects of Ashwagandha (Withania somnifera) on VO2max: A Systematic Review and Meta-Analysis
Meta Analysis Nutrients 2020 PubMed DOI
B Does Ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Phytotherapy research : PTR 2022 PubMed DOI
B An update on the efficacy of anti-inflammatory agents for patients with schizophrenia: a meta-analysis
Meta Analysis Psychological medicine 2019 PubMed DOI
B Safety and efficacy of Withania somnifera for anxiety and insomnia: Systematic review and meta-analysis
Meta Analysis Human psychopharmacology 2024 PubMed DOI
B Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis
Meta Analysis PloS one 2021 PubMed DOI
B Plant-derived nootropics and human cognition: A systematic review
Systematic Review Critical reviews in food science and nutrition 2023 PubMed DOI
B Effects of Ashwagandha (Withania Somnifera) on stress and anxiety: A systematic review and meta-analysis
Meta Analysis Explore (New York, N.Y.) 2024 PubMed DOI
B Systematic review and network meta-analysis of the effects of plant active substance on quality of life in breast cancer patients
Systematic Review Frontiers in pharmacology 2025 PubMed DOI
B Clinical evidence for the adaptogenic effects of Withania somnifera and Rhodiola rosea - A systematic review with molecular interpretation of psychometric outcomes
Systematic Review Annals of agricultural and environmental medicine : AAEM 2026 PubMed DOI
View all evidence for Ashwagandha →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.