Non-GMO 100% Vegan Dietary Supplement Sinus Support With Vitamin C, Bromelain & More Lab Verified Discussion: Solaray Mega Quercetin is a powerful combination of the bioflavonoids quercetin, rutin and hesperidin. Bioflavonoids may help support normal healthy sinus, respiratory and immune function. Bromelain is a plant enzyme known to help breakdown protein. Vitamin C provides antioxidant activity and is intended to help normal, healthy collagen synthesis, capillary and blood vessel integrity, cartilage and bone development, immune function and nerve impulse transmission.