Vitamin D's wild days: Who to test, what to take?

the OVERWHELMING evidence on overdosing on vitamin D3 is that huge quantities (>>20,000 IU) must be taken for a l o n g time and it is VERY rare. (vitamin D2, the prescription, and un-natural, form of vitamin D, however, is a different story.)

The risk/benefit ratio is so tiny that it is hardly worth worrying about unless;
1) you want to create a news story or
2) you want to spread confusion, a classic technique of the industrial medical system, esp. big pharma.

When a significant portion of the general population begins to maintain it's D3 blood level at about 50 ng/ml, (estimated optimum, today) the income of the industrial medical cartel is going to drop precipitously due to significantly reduced cancer, heart disease, et al rates. So, watch out for the up-coming shenanigans from these predators in their attempts maintain their bottom line.

Read; http://www.vitami...cil.org/
or do your own extensive literature search and draw your own conclusions. [Just beware that there are a lot of related compounds called vitamin D that behave, in the body, in undesirable ways. Some of the trials on some these compounds were clearly designed to spread confusion.] D3 (cholecalciferol) is the compound of interest.