D-Mulsion 1000 by Seroyal Genestra is s form of Vitamin D-3 via a citrus-flavored liquid allowing you to experience its health benefits in a more palatable form. Vitamin D is a nutrient that aids in roles that are vital to assisting your body to function appropriately. Vitamin D is similar to a hormone in the way that it regulates processes in the body for calcium absorption into the bone.