Quercetin is a polyphenolic flavonoid compound which has antioxidant and anti-inflammatory properties. Why quercetin? NOW chose to test quercetin due to the increased demand seen during the COVID-19 pandemic, when raw material costs climbed. The Test was focused on evaluating unfamiliar brands selling quercetin on Amazon. Both NOW internal lab and 3rd party lab called Eurofins conducted the tests, and evaluates the results compared to label claims. The report was generated on April 2022, shows only 3 brands equal or greater than 100% potency which meet the label claims. 1 brand contains 0% quercetin. 20 out of 24 brands tested below 90% label potency. 14 out of 24 brands tested with less than 50% of labelled potency.

Other than the test results, we also list up ranking of natural foods which contain quercetin and a couple of tips Dr. David Sinclair mentioned on choosing a good supplier. Hope you enjoy this short video!

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DISCLAIMER: Please note that none of the information in this video constitutes health advice or should be substituted in lieu of professional guidance. The video content is purely for informational purposes.

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