No offense, but there's actually quite a bit of evidence disputing that "fact", which has been taken for common knowledge for quite a number of years. http://www.vitamindcouncil.org/vitaminDToxicity.shtml There's also a growing body of knowledge that indicates that the current RDA for vitamin D is much too low, and that vitamin D plays a much larger part in maintaining proper health than was previously believed. However, the part about consulting your doctor before doing anything is spot on!