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NOW Testing of St. John’s Wort Reveals Widespread Failure

by Shari Barbanel | November 11, 2025

NOW Health Group (Bloomingdale, IL) continued its testing program of supplements sold on Amazon. This round of testing focused on the popular herb St. John’s wort. Results showed that every product (except for NOW’s brand) failed potency testing. Several samples contained synthetic dyes, which are commonly used to make low-quality or adulterated products appear authentic, ...

NSF Launches DNA Authenticated Mark for Dietary Supplement Ingredients

by Shari Barbanel | February 21, 2018

For the first time, dietary supplement ingredient suppliers can use an on-label, NSF DNA Authenticated mark to verify the identity and purity of raw ingredients. NSF International recently launched its new, independent testing protocol and verification program for raw botanical ingredients used in the dietary supplement industry. In addition to DNA authentication of the target ...

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