ESSENTIAL VITAMIN COMPLEX: Vitamins A-D-K packs a high-potency blend of essential vitamins A, D3 (5,000 IU), K1 and K2 (MK7 + MK4) that work together to support bone, heart and immune health. ACTIVE VITAMIN A: Vitamin A is commonly used interchangeably with beta-carotene (the stuff in carrots), but they are very different. Vitamins A-D-K uses a form of vitamin A called retinol (from retinyl palmitate) known as "Active" vitamin A. You won't find this form used in most complexes, but science has proven it critical in supplementation because beta-carotene absorption can be as low as 9%, where retinol absorption can be as high as 90%. CLINICALLY BACKED, FULL-SPECTRUM VITAMIN K: Vitamins A-D-K provides three forms of vitamin K that are utilized differently by the body, allowing both rapid and sustained availability. This is key, because vitamin K is required to transport the calcium vitamin D helps absorb from the bloodstream into the bone, supporting bone density and cardiovascular health. Vitamin K1 supplementation is important because K1 from food is under-absorbed due to its being bound to the fibers of leafy greens.