Randomized, Double-Blind, Crossover Study Comparing the Bioavailability of 4 Ashwagandha (Withania somnifera (L.) Dunal) Extracts in Healthy Adults Under Fasting Condition

These findings emphasize the critical role of withanolide glycosides in determining the PK performance of ashwagandha supplements. The enhanced bioavailability of WS-35 supports its preferential use in therapeutic applications and provides a strong rationale for further investigation into dose-response relationships and the long-term efficacy of standardized, high-bioavailability formulations. Clinical Trial Registry of India identifier: CTRI/2020/10/028397.