Quercetin is an antioxidant bioflavonoid found throughout the plant kingdom in rinds and barks. Food sources include onions, red wine, green tea, and St. John’s wort.
Our quercetin is derived from a noncitrus, hypoallergenic plant source, the Japanese Pagoda tree (Sophora japonica L.).
Quercetin 300 provides high-potency quercetin, with additional stabilizing antioxidants to prevent auto-oxidization (spontaneous degradation).
We use synthetic vitamin E in the formula, so it does not contain soy or other common allergens.
Quercetin and other bioflavonoids can enhance the body’s ability to control the release of histamine and other important signaling pathway metabolites, such as prostaglandins and leukotrines.
They can support the integrity of mast cells, possibly due in part to their ability to stabilize cell membranes, making them less reactive to allergens.
Overall, quercetin and other bioflavonoids appear to support the health of the vascular system,
by enhancing the strength and permeability of the capillaries, supporting coronary vasorelaxation, and helping to protect cholesterol and tissues in the body from oxidative damage.
Specifically, quercetin has been observed to inhibit aldose reductase, and possibly tyrosine kinase and nitric oxide synthase;
to inhibit the degranulation of mast cells, basophils and neutrophils; and to modulate the activity of NF-kappaB.
Animal studies have demonstrated quercetin can promote healthy gastric mucus production, potentially providing gastro-protective effects.
The gastro-protective, as well as the potential cardioprotective effects of quercetin, may also be due to its ability to inhibit lipid peroxidation.
Some preliminary research suggests that quercetin may potentially support the normal functioning of a healthy immune system.
Results of recent open-label studies suggest that quercetin may also be helpful for healthy prostate function.
