Vitamin D3 (Cholecalciferol) is the active form of vitamin D, preferred for its bioavailability. Vitamin D3 is essential for good health and is also a key nutrient in supporting proper immune function. Integrative Therapeutics Vitamin D Cell Defense gummies are formulated with 250% DV of vitamin D3 per 2 gummy serving to provide high potency support for immune health and strong bones.