Causes & Dosage What is Vitamin D3? Cholecalciferol is the scientific name for vitamin D3. Vitamin D3 can be taken to improve overall health issues. It can also be used to treat conditions in which vitamin D3 levels is low. Vitamin D3 supports the kidneys to recycle phosphate back into the blood, which helps the blood to maintain it’s right ph. It helps people who have underactive parathyroid glands. Causes of Vitamin D3 Deficiency The one of the most important role of vitamin D is keeping your immune system strong. Children with bow-shaped legs have deficiency of vitamin d3. Adults with deficiency of vitamin D3 may start to have their bones softer also known as osteomalacia. People having low levels vitamin D3 also have digestive problems. The natural source of vitamin D3 is sunlight, and people who hardly go outside in the sun are most likely to be deficient in vitamin D3. People with darker skins tone needs more sunlight to maintain vitamin D3 levels. As the extra melanin found in darker skin opposes the absorption of vitamin D3. While many experts advise people to avoid sunlight during the time 10 AM in the morning to 3 PM in the afternoon to protect their skin from cancer. Vitamin D3 Dosage Vitamin D3 is available in tablet form in variants of 400 IU and 1000 IU per tablet. You can also buy vitamin D3 and calcium combined with in a single pill. You should not consume more than 4,000 IU a day of vitamin D3 unless you are prescribed by your doctor. In general, it’s best to take vitamin D with your meal. This may vary with prescription forms of vitamin D. If are suffering from osteoporosis and are over 50 years old, you should consume over 800 to 1000 IU (20 to 25 mcg) a day of vitamin D with calcium. Your doctor will determine the right dosage for you if are suffering from underactive parathyroid.