Immune Support & Synergistic Antioxidants. Dihydroquercetin-3-rhamnoside (D-3-R) is a flavonoid and potent water soluble antioxidant that is synergistic with Vitamin C. Unlike many flavonoids D-3-R is very bioavailable. Professor Szent-Gyorgyi the recipient of the Nobel Prize for Vitamin C categorized flavonoids such as D-3-R as "vitamin P" making Vitamin C more biologically active and available.
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