SOLGAR® Earth Source Koji Fermented Zinc is formulated to support immune system health. This food-based zinc starts by growing the koji culture on cooked rice. As the koji matures and ferments, it is enriched with zinc, transforming mineral zinc into a bioavailable form through an ancient Japanese fermentation process. Zinc is a trace mineral crucial for normal immune system function, cognitive function, and maintaining healthy skin, nails, and hair. It also helps protect cells from oxidative stress and supports normal fertility and reproduction. Each vegetable capsule provides 25 mg of Zinc from Koji Fermented Zinc, Ultimine™.