Sunshine in a Capsule with Vitamin D3 provides 25 mcg (1,000 IU) of cholecalciferol and 100 mcg of Vitamin K2 per capsule. Cholecalciferol, otherwise known as vitamin D3, is produced when the sun touches human skin. Cholecalciferol helps promote numerous health benefits including supporting a healthy immune system, nervous system and positive mood. Vitamin D3 plays an important role in calcium absorption, plus is essential to bone, teeth and muscle health. Vitamin K2 is important to help regulate normal blood clotting and boost energy production.