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Onions

Allium. Highest concentration of quercetin in common foods; red onions slightly richer.

Compounds in this food

2 growers

Fisher Farms
Unverified
Blythe, CA, US
Certification: CCOF
Cal-Organic Farms
Unverified
Lamont, CA, US
Certification: CCOF

Growing method sources

Documented — confirmed by certification body, lab test, or published standard
Grower claims — stated on grower website or marketing materials; not independently verified
Inferred — based on regional conditions, growing category, or certification type; not directly confirmed