potency
NOW Testing of Oregano Oil Supplements Finds Two-Thirds Failed Potency
NOW (Bloomingdale, IL) recently tested 35 oregano oil supplements purchased from Amazon. Results showed that nearly two-thirds of the products failed potency testing and six had no detectable carvacrol, the active measurable component in oregano oil. In fact, many of the soft gel samples contained virtually no oregano smell or taste, according to NOW. NOW ...
NOW Testing of St. John’s Wort Reveals Widespread Failure
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 single 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 ...
The Various Forms of Magnesium: Good, Better, Best
In May of 2013, I wrote an article for Vitamin Retailer titled, “Magnesium: A Mineral With Multiple Applications.” At that time, magnesium was already a trending nutraceutical in the dietary supplement industry—but that was only the beginning. In 2024 the magnesium market size was valued at $29.3 billion with estimations to reach $40.8 billion by ...
NOW Testing of Methyl B12 Brands Highlights “Inherent Complexity”
NOW (Bloomingdale, IL) continued its award-winning quality testing program with a survey of 25 different brand samples of methylcobalamin (methyl B12) purchased on Amazon in January 2025. Methyl B12 was chosen because of its high cost and potential failure of its potency label claim. The results once again identified brands not meeting label claims, but ...
NOW Testing of SAMe Brands From Amazon Reveals Continued Labeling and Quality Problems
The most recent examination from NOW’s (Bloomingdale, IL) award-winning testing program, demonstrated “profound quality and labeling failings continue” for SAMe samples purchased on Amazon in October 2024. This is the 19th round of testing NOW has performed. NOW previously investigated “suspicious” SAMe (S-adenosylmethionine) supplements from Amazon in March 2020 with all 11 testing at low ...
NOW Presses Amazon to Act Against Deceptive Dietary Supplement Sellers
NOW continues to press Amazon to act against sellers of dietary supplements seeking to trick consumers into thinking their products are quality, the company stated. In the latest tactic, NOW said it spotted a brand posting certificates of analysis from a third-party testing lab on their website confirming fill weight. Not identity, potency or purity–just ...
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