Understand vitamins A, D, E, and K—fat-soluble nutrients stored in your body’s fatty tissues and liver. Explore retinol for vision health, cholecalciferol (vitamin D3) for calcium absorption, tocopherols for antioxidant protection, and menaquinone (vitamin K2) for bone and cardiovascular health. Learn about optimal forms, absorption factors, and the importance of adequate dietary fat for assimilation.