AHCC - Active Hexose Correlated Compound. AHCC is Japan's best selling immune support dietary supplement which is now available in the United States! This product was developed in Japan under using state-of-the-art biotechnology to create a formula which would be more effective than using any combination of single mushroom products. AHCC (Active Hexose Correlated Compound) is an extract obtained from a hybridization of several species of mushroom mycelia. AHCC supports normal immune function and may improve number and functions of Defense mechanism of body cells.