It will be interesting to see if you can get your vitamin D to normal range. I know of at least one person who told me that the prescription vitamin D they got wasn't budging their levels, and that some people will do better with a different form of vitamin D. So if a retest doesn't show enough change you may want to look into an OTC in a different form. I believe I've also heard that it's best to take the vitamin D with some kind of food with some oil or other fats in it, since the D is fat-soluble.