Ultra-D 5000 (K78) offers vitamin D (cholecalciferol) with its key cofactors in a base of cod liver oil, which is a natural source of vitamin D, vitamin A, EPA, and DHA. The formula was designed to support the metabolism of vitamin D and to deliver a powerful mix of nutrients.Ultra-D 5000 further incorporates vitamin K, which should not be taken with certain medications, such as anticoagulants. This advanced complex includes 5000 IU of vitamin D per serving (in a pleasant orange flavor without an unpleasant fishy taste). Other nutrients, such as magnesium, biotin, pantethine, calcium, and boron, are all incorporated. Ultra-D 5000 (K78) also utilizes rosemary leaf extract, which includes bioflavonoids—such as genistein and carnosic acid—that may support bone metabolism. For further systemic support of metabolic pathways, both forms of vitamin K—including phytonadione (K1) and menaquiones (K2)—have been added to this formula.