Quercetin
What quercetin is, which foods contain it, how plain quercetin, phytosomes and bromelain complexes differ, and how to choose.
This substance has no health claim authorised in the European Union. So we describe what it is and how it is taken, but do not say what it does in the body.
What it is
Quercetin is a plant pigment of the flavonoid group. Red onions, capers, apples with their skin, berries, tea and buckwheat are rich in it. For supplements quercetin usually comes from the Japanese pagoda tree (Sophora japonica).
Quercetin has no authorised health claims in the European Union, so we do not write about immunity, allergy or blood vessels; we describe the substance and how to compare products.
Forms
Quercetin is most often sold as the dihydrate, 250–500 mg a capsule. It dissolves poorly in water, so there are phospholipid forms (phytosomes such as Quercefit) and complexes pairing it with bromelain or vitamin C. Vitamin C has authorised claims, shown on the product page when its dose is enough.
How it is taken
Take as the pack directs, with a meal. Pregnant or breastfeeding women, people with kidney conditions and anyone on antibiotics, blood thinners or other regular medicines should ask a doctor first.
Frequently asked questions
Which foods contain quercetin?
Red onions, capers, apples with their skin, berries, tea and buckwheat.
What are quercetin phytosomes?
Quercetin bound to phospholipids. A technological form that costs more than plain dihydrate.
Why is quercetin paired with bromelain?
It is a common recipe among makers. We show the contents, and authorised claims only for the substances that have them.
Products with quercetin
