Yeah, as with most supplements and medication the dose for a jockey and a sumo wrestler should not be the same. Many researchers have found that the dose of Vitamin-D3 is clearly body weight dependent with a growing number finding that the requirement is increased with increasing obesity above what just body weight suggests. I have tabulated what I have extracted from the research and made some handy tables that provide a first approximation of what one could take to try and achieve physiological serum levels. I link here to my chart and if you scroll back a bit you will get my other more general suggestions. Basically about half of urban folk are deficient and taking a supplement is prudent if you do not get daily equatorial sun on a lot of skin. cholecalciferol.mirahez…