yes, be careful--get your levels checked before you start supplementing, so you can monitor whether you indeed need to supplement, and how long it takes to get to a good level if you do need to supplement. I am one of those that overdosed--but my OH25 levels went only to where many of the proponents of taking high dose D recommend---that is, the level was above 50, but still within the range. BUT then I started seeing calcium deposits on my xrays of neck --ie carotid artery; then had ultrasound of abdomen (need one each year re: liver problem), and thiss time it showed calcification in arteries of abdomen. So got full ultrasound of carotids and solar plexus area, and indeed, calcification throughout. This was NOT there prior to taking large doses of Vit D ! I then had my Dr test my vitamin D 1 25 level (health insurance does not want to cover this, and if you read the CURRENT arguments, this is not a test needed, you only need the OH 25 level in order to supplement). BUT THIS IS WRONG. If you go back to the older advice on Vit D, you see must be careful with it, one of main reasons being the 1 25 D increases with supplementation, and if too high, this interferes with the parathyroid function, and then TOO MUCH CALCIUM IS DEPOSITED, AND MOST OFTEN IN SOFT TISSUE (IE NOT BONE). This is what happened to me--Indeed, my 1-25 was too high!
So stopped all supplementation for several months, retested and 1-25 now at good level, but the OH25 now at insufficiency level of 27. BUT I will post later (need to find the articles) the level the OH25 is best at is about 35--NOT the 50 or higher currently recommended.. when go above 35, run into problems of various sorts.
So, I am cautiously supplementing, and will retest soon, in order to make sure do not go above the 35.
And of courseI am taking supplements and changing diet in order to get out the calcium deposited in the wrong places. Might even do chelation again. Will get an ultrasound in 6 months to track progress on that.