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For example, the skin of an apple contains quercetin, a powerful antioxidant, along with much of the fruit’s dietary fiber.

We spied a paper showing that quercetin is a good inhibitor of ALDH.

Quercetin is a phenolic compound found in the skins of grapes, so it's much more abundant in red than white wines because red grape skins are left in longer during the fermentation process than white grape skins.

Then, we added the suspected inhibitors – quercetin, as well as some other phenolics we wanted to test – to see whether they slowed the process.

These tests confirmed that quercetin was a good inhibitor.