A bright orange glass does more biochemical planning than most supplement shelves. Carrot juice loads the bloodstream with beta-carotene, a vitamin A precursor that stays inert until specific enzymes in the gut and liver split it into retinal and retinol on demand.The bold claim is simple: eyesight gets first priority. In the retina, beta-carotene–derived retinal forms rhodopsin, the light-sensiti...More