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Quercetin Supplements

Most Quercetin Brands Fail Test

5/13/2022
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Twenty out of 24 brands of quercetin purchased on Amazon contained much less quercetin than listed in a recent analysis. For details by brand, see the Quality Concerns section of our Quercetin Review.

Quercetin for Severe COVID?

12/06/2021
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Does quercetin help people with severe COVID-19? See what a recent study suggests in the Viral Infections section of our Quercetin Supplements Review. Also see our Top Picks for quercetin.

Quercetin & COVID

11/04/2021
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Find out if quercetin helped people with early-stage COVID-19 in a recent study. Details are in the Viral Infections section of our Quercetin Supplements Review, which includes our test results and Top Picks among quercetin supplements.

Is Quercetin Safe?

3/30/2020
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Quercetin has been proposed as a treatment for a range of medical conditions, including COVID-19, but is it safe? Find out what studies have found, including results of a recent, small clinical trial, in the Concerns and Cautions section of the Quercetin Supplements Review. Also see our Top Picks for quercetin.