Vitamin D3 (also known as cholecalciferol) is a fat soluble vitamin which plays an important role in maintaining blood levels of calcium. The majority of vitamin D in the body is created during skin exposure to sunlight, but can also be found in egg yolk, fish oils & oily fish such as salmon, herring & mackerel. Cholecalciferol is an animal source of vitamin D3. What does Vitamin D3 do? Vitamin D3 increases the absorption of calcium from food & reduces the excretion of calcium from the body. These effects ensure that calcium levels are maintained & allow adequate levels to be stored in bones & teeth. Vitamin D promotes healthy blood calcium levels & in turn may help bone strength. Vitamin D is also responsible for maintaining healthy muscles & nerves, & for maintaining a healthy immune system. Directions: 1 capsule per day, preferably with food & water. In case of doubts consult your physician or pharmacist. Sugar, yeast & gluten free. Suitable for vegetarians.