Vitamin D3 can be taken as a supplement to improve overall health or used to treat osteoporosis.It can also be used to treat conditions in which vitamin D3 levels may be low, such as in people who have underactive parathyroid glands, low levels of phosphate in the blood, or hereditary conditions in which the body doesn’t respond to the parathyroid hormone.
Vitamin D3 also encourages the kidneys to recycle phosphate back into the blood, which helps the blood stay at the right pH.Historically, vitamin D3 loss has been associated with rickets, a disease caused by low levels of vitamin D3 that commonly affects children.Children with rickets and adults who had rickets as children often have legs that are bow-shaped.However, while adults who are deficient in vitamin D3 do not typically develop rickets disease, their bones may start to become softer — a condition known as osteomalacia. People with digestive problems like celiac disease, liver problems, or Crohn’s disease are more likely to have low levels vitamin D3. Sunlight is a natural source of vitamin D3, and people who rarely or never go outside (for example, those in nursing homes or bedridden hospital patients) are most likely to be deficient in it. Also, the darker your skin, the more sunlight you need to keep vitamin D3 at healthy levels. This is because the extra melanin found in darker skin slows the absorption of vitamin D3. Some studies suggest that the time of day when you receive sunlight affects how well your body absorbs vitamin D3.