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Foods rich in isoquercitrin include leafy vegetables, broccoli, red onions, peppers, apples, grapes, black tea, green tea, red wine, and some fruit juices. The amount of quercetin received from food is primarily dependent on an individual's dietary habits.
Quercetin is part of the fix, a combo of quercetin and a proteinase is best, a grapefruit would be better than an apple. So would an onion. But also, you wouldn't want to eat a real lot of grapefruit either, so getting it from different sources is best. I think that the source of quercitin to make the supplements from is usually from apple peels, because they can get those at low costs from apple canning and processing facilities. A lot of apples are processed in this country and the peels can actually be profitable instead of paying for burying them in landfills.
originally posted by: ketsuko
a reply to: rickymouse
Yes, I looked it up. It is in grapefruit too. That's also good. Son and I love us some grapefruit ... without the sugar even. Broccoli is one of our staple dinner table veggies and husband always has an apple for his breakfast.
Plenty of quercetin in this household.