Sun 7 Apr, 2013 11:46 pm
Vitamin D contains fat-soluble secosteroids responsible for intestinal absorption of calcium and phosphate. There are 5 forms of vitamin D D1 D2 D3 D4 and last D5. People who are exposed to normal quantities of sunlight do not need vitamin D supplements because sunlight promotes sufficient vitamin D synthesis in the skin. High blood levels of vitamin D were found to protect even healthy people at a genetic level.