It's worth noting that the science behind Vitamin D supplements is far from settled. On Nov 30, 2010, the USRDA lowered their recommended amount from 2000mg to

It's worth noting that the science behind Vitamin D supplements is far from settled. On Nov 30, 2010, the USRDA lowered their recommended amount from 2000mg to 600mg for healthy adults. This reflects what the EU publishes as the recommended amount. From wikipedia: "There is some disagreement concerning the exact levels of 25-hydroxy-vitamin D needed for good health. A level lower than 10 ng/mL (25 nmol/L) is associated with the most severe deficiency diseases: rickets in infants and children, and osteomalacia in adults. A concentration above 15 ng/ml (37.5 nmol/L) is generally considered adequate for those in good health. Levels above 30 ng/ml (75 nmol/L) are proposed by some as desirable for achieving optimum health, but there is not yet enough evidence to support this." That quote is supported by 3 different citations on the wiki page as well. http://en.wikipedia.org/wiki/Vitamin_D#Nutrition http://en.wikipedia.org/wiki/Vitamin_D#Nutrition