Puritan's Pride, Quercetin Dihydrate 650mg with Vitamin D 800IU, 60 CapsulesProduct Description Quercetin dihydrate with vitamin D this formula also contains vitamin D, a fat soluble vitamin that can be obtained through the diet or synthesized in the skin upon exposure to sunlight. Vitamin D is known for its many benefits, including assisting in maintaining a healthy immune system. Product Benefits Dietary Supplement. For health and wellness. A Non Citrus Bioflavonoid. Contains Vitamin D For Support Of Healthy Immune