AHCC 100% Pure Powder 2 oz by NOW FoodsAHCC (Active Hexose Correlated Compound) is a proprietary extract produced from specially cultivated and hybridized mushrooms. According to extensive research in humans, as well as numerous non clinical studies, AHCC supports healthy immune system function through its effects on macrophages and NK (Natural Killer) Cells. NK cells and the intercellular mediators they produce are critical for the maintenance of healthy cell cycle function. AHCC has also