ByDr. Brennan Commerford, D.C.·Last reviewed: July 2026
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Ashwagandha (Withania somnifera) Root Extract: verification pending

We’re confirming the science for this compound before we publish a form ranking. Our team reviews every ranked page against peer-reviewed absorption data — this one is still under review, so we are not showing a score yet.

Check back soon. Rankings are reviewed by Dr. Brennan Commerford, D.C.

References

  1. Human crossover PK: per-gram withanolide absorption rose sharply with standardization grade, the 35% withanolide-glycoside extract reaching AUC roughly 118 to 268-fold higher than 2.5%, 5%, and 10% extracts. PubMed
  2. Human crossover PK: a 35% withanolide-glycoside extract was roughly 280-fold more bioavailable per mg than a 2.5% withanolide extract, quantifying the standardized-vs-unstandardized gap. PubMed
  3. A randomized human trial reported that a full-spectrum ashwagandha root extract (300 mg twice daily for 10 weeks) was associated with shorter sleep-onset latency and improved sleep efficiency versus placebo. PubMed

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.