| Since vitamin D is absorbed in the small intestines, persons with diseases that prevent proper absorption--such as liver disease, cystic fibrosis, Whipple's disease and sprue-may develop vitamin D deficiency.
Vitamin D production plateaus after a short amount of time in the sun. More exposure won't produce extra vitamin D, just skin damage.
Excess vitamin D from supplements (greater than 50 micrograms or 2000 IU per day) can result in kidney damage, kidney stones, weakened bones and muscles, and possibly death. |
