According to literature published by a major «activated» quercitin manufacturer / distributor, Threshold Enterprises Ltd. (Source Naturals brand), various clinical studies have demonstrated that vitamin C improves the absorption
of quercitin].
NOTE: As quercitin is very poorly absorbed in the human gut, it is recommended that patients take a more bioavailable form such as water soluble quercitin hydrate or «activated» quercitin [Activated quercitin is a combination
of quercitin and bromelin and magnesium ascorbate.
A 2007 study looked at buckwheat and found: «Concentration of rutin [antioxidant compounds] was increased more than 10 times, with the production
of quercitin and one newly formed flavonoid during 48 h germination.»
Not exact matches
Organic berries and all fruits and vegetables because they contain various photochemicals like antioxidants (vitamins C, E, beta - carotene and various minerals), bioflavonoids (like
quercitin, limonene, hesperidin), and fiber which is needed for daily elimination
of waste and support the healthy balance
of the micro flora
of the digestive tract.
Interestingly, the marriage
of ascorbate with
quercitin packs its own therapeutic punch.
Juices made from fresh fruits and berries are good sources
of flavonoids, such as
quercitin, hesperitin, naringenin, eriodictyol and catechin.
Kale is an especially good source
of the anti-oxidants lutein, beta - carotene, kaempferol and
quercitin, all associated with possible cancer benefits.