Skip to content
DE
Botanical

Quercetin

Quercetin is a plant flavonoid found in foods such as onions and apples.

Also listed as Quercetin Phytosome, Sophora Japonica, Quercetin Extract, Apple extract

LongevityCardiovascularGut HealthImmune SupportWeight Management

Is long-term use established as safe?

The safety review found mostly mild reported adverse effects but insufficient long-term data for doses of at least 1,000 mg beyond 12 weeks. Animal findings raise questions about pre-existing kidney damage and estrogen-dependent tumors; they do not establish these harms in humans. 1

Can medicines interact?

MSK reports increased anticoagulation in a warfarin case and laboratory interactions with drug-metabolizing enzymes. Clinical relevance varies, so medication review matters before supplementation, particularly during cancer treatment. 2

For information, not individual medical advice. Ingredient studies do not establish the effectiveness of these products.

Sources

  2. Quercetin Memorial Sloan Kettering Cancer Center