NOW Foods Ashwagandha Extract

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NOW Foods Ashwagandha Extract

450 mg standardized 2.5% withanolides. Vegan. GMP certified.

NOW Foods Ashwagandha Extract

★★★★☆4.6 / 5 rating
450 mgPer cap
2.5%Withanolides
90Servings
GMPCert.
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NOW Foods Ashwagandha Extract

Prices change often, so we link straight to the retailer instead of quoting one. We earn a commission from purchases through these links, at no cost to you.

450 mg standardized 2.5% withanolides. Vegan. GMP certified.

What is NOW Foods Ashwagandha Extract?

NOW Foods Ashwagandha Extract is part of our editor-vetted catalog of premium supplements. Our research team reviews each formula’s third-party testing, clinical research, and value to bring you transparent, evidence-based recommendations.

At a Glance

  • Per cap: 450 mg
  • Withanolides: 2.5%
  • Servings: 90
  • Cert.: GMP

How We Researched This Product

Our editorial team evaluates every product against criteria including: ingredient quality and bioavailability, third-party testing (USP, NSF, ConsumerLab), dosage compared to clinical research, brand reputation and manufacturing standards, value per serving, and customer feedback patterns.

Where to Buy

Click any of the price-comparison buttons above to check current pricing at our verified retail partners. As an Amazon Associate we earn from qualifying purchases.

Important Notes

Educational content — not medical advice. Consult a qualified healthcare provider before adding any supplement to your routine, especially if you take prescription medication or have a medical condition.

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Scientific References
  • 1Chandrasekhar K, et al. (2012). 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. Indian J Psychol Med. PMID 23439798
  • 2Wankhede S, et al. (2015). Examining the effect of Withania somnifera supplementation on muscle strength and recovery. J Int Soc Sports Nutr. PMID 26609282
  • 3Lopresti AL, et al. (2019). An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract. Medicine. PMID 31517876
  • 4Ambiye VR, et al. (2013). Clinical evaluation of the spermatogenic activity of the root extract of ashwagandha in oligospermic males. Evid Based Complement Alternat Med. PMID 24371462

All studies are peer-reviewed and sourced from PubMed/NCBI. This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any supplement regimen.

❓Frequently Asked Questions
In trials, the clearest effect of ashwagandha is a modest drop in the stress hormone cortisol (about 1.2 µg/dL on average in a 2025 meta-analysis of 7 trials). The NIH says some preparations may help with stress and insomnia, the evidence on anxiety is unclear, and the evidence for testosterone is limited. Laboratory studies suggest it may act on GABA receptors.
Mild calming effects can appear within 1–2 weeks. Full adaptogenic benefits — reduced cortisol, improved testosterone, better sleep, and anxiety reduction — typically require 6–8 weeks of consistent daily use. Most clinical trials showing significant results run for 8–12 weeks.
Both are excellent standardized root extracts. KSM-66 (300–600mg, standardized to ≥5% withanolides) is the most studied form for testosterone, strength, and energy. Sensoril (125–250mg, standardized to ≥10% withanolides) is more concentrated and often preferred for sleep and anxiety. Neither is definitively superior — both have more evidence than unstandardized powders.
There is no good evidence that ashwagandha causes weight gain, or that any weight change while taking it is muscle rather than fat.
Yes — ashwagandha has several important interactions. It may interact with medicines for diabetes and blood pressure, immunosuppressants, sedatives and anti-seizure drugs. The NIH does not recommend it for people with thyroid or autoimmune disorders, before surgery, or during pregnancy and breastfeeding. Always consult your doctor if you're on prescription medications.