Immune boost day Combines phytosomal Quercetin which is 20 x better absorbed and 11 times more soluble than regular Quercetin. Quercetin is a potent anti-inflammatory and antioxidant making it great for joints, wrinkles, allergies (including hayfever, animal allergies, asthma and eczema), it boosts energy and improves post training recover, boosts the immune system and as an anti-viral.This incredible formula also has the top 3 vitamins for lung and immune health , Vitamin A, D and C.