Sunshine Super Vitamin D 2,000 IU provides 50 mcg of cholecalciferol (vitamin D3) per tablet. Vitamin D3, is produced when the sun touches the human skin and synthesizes D3 from cholesterol. This important fat-soluble vitamin helps promote numerous health benefits including supporting a healthy immune and nervous systems and positive mood. Vitamin D plays an important role in calcium absorption, plus is essential to bone, teeth, and muscle health. Sunshine Vitamin D deficiency may occur among individuals with darker skin, overuse of sunscreen or limited exposure of the sun. Vitamin D deficiency may cause pain in the bones, muscle weakness and fatigue, which is why it is so critical to supplement with vitamin D for optimal health and well-being. Each bottle of Sunshine Super Vitamin D contains 60 single serve tablets. Each tablet contains 2,000 IU (50 mcg) Vitamin D (as D3) and 50 mg of calcium.