Clinical studies have typically been performed with ashwagandha root preparations providing at least 6 mg per daily serving of compounds known as withanolides. Yet, of eight ashwagandha supplements selected for testing by ConsumerLab, three contained less than this amount -- one of which provided less than one milligram. Another product contained only 64.7% of the withanolides expected from its label, and two other products contained much higher amounts of withanolides than listed.
ConsumerLab.com did identify three ashwagandha supplements with accurate labeling and daily doses in-line with those used in successful clinical trials. These three products were Approved for Quality by ConsumerLab.com. One of these products was tested through ConsumerLab.com's voluntary
Quality Certification Program.
Pure Encapsulations Ashwagandha (providing 12.5mg withanolides at 1 capsule per day), and
Solaray Ashwagandha (providing 7-14mg withanolides at 1 to 2 capsules per day).
By virtue of a different testing process, Consumer Lab also approved Plnt by V Ashwagandha (Vitamin Shoppe).
