Vitamin C with Dihydroquercetin icontains vitamin C, which protects the body from free radicals and fights oxidative stress, both insults that threaten the immune system. A major immune fighting activity of Vitamin C is boosting glutathione levels in human lymphocytes, cells that make up about 25% of all white blood cells in the blood. Vitamin C is also vital for general tissue health, collagen formation, adrenal function, and the proper utilization of other nutrients. Dihydroquercetin helps control allergic reactions.