quercetin is the most researched of the flavonoids having been used in human trials & delivering some very compelling results. flavonoids are water-soluble plant pigments commonly found in black & green tea as well as in onions & apples. whilst an apple contains 5-10mg quercetin each of these tablets delivers a powerful 500mgthis product provides concentrated quercetin from natural plant sources in high doses to help protect your cells from oxidative damage as you push your body hard through training & sport. flavonoids convert free radicals into less reactive compounds protecting cell structure from damage & have the added benefits of reducing the body's production of histamines. recent research also highlights quercetin's beneficial effects on cardiovascular health. highest potency available in the uk safe but powerful dose a highly active flavonoid one of the most researched fast release tablet specially coated for ease of swallowing