How much quercetin is in a cup of green tea?

In our study, the green tea infusion contained 2.1 mg quercetin 100 mL− 1, whereas it had been previously reported to contain 0.11 mg or 4.23 mg quercetin 100 g− 1 [26,27]. Because onion and green tea are the most common vegetable and beverage, they appear to be the major food sources of quercetin in Japan.

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How much quercetin is in a glass of red wine?

The daily amount of quercetin provided by the three foods was almost the same. Thus, the wine provided 14.2 ± 0.3 mg (±sd) quercetin, 1.5 ± 0.1 mg kaempferol, 1.6 ± 0.0 mg isorhamnetin and 6.7 ± 0.1 mg myricetin per d.