Detox is not a cleanse but a genetic program built into human cells. Vitamin A is a master switch for immunity, tissue repair, inflammation control, and detox. Only animal foods provide ready-to-use retinol; plant carotenoids must be converted in the liver and many people do this poorly. Small weekly servings of liver maintain vitamin A reserves, supporting bile flow, detox enzymes, and the epithelial barriers of the gut, lungs, and skin that block toxins and germs.