Country Life's Aller-Max™ is a unique complex based on the key ingredients of Quercetin, Bromelain, and Vitamin C. quercetin is a naturally occurring non-citrus bioflavonoid derived from flower buds. Bromelain is an enzyme derived from Pineapple Stem. Aller-Max also provides Vitamin C as well, alongside herbs like Stinging Nettle and Cayenne.