I've been treated with Vitamin D supplements for 6 mos., numbers for total 25-Hydroxy D went from 31, to 24, to <6.0 and now 114....first I wasn't absorbing enough and now after megadoses of Vitamin D I'm considered 'toxicity'...my Dr.'s just subscribed 2000 units daily....I'm concerned, I do have hypothyroidism and think that may have something to do with it...just don't want to accept 'just take 2000 units a day' and that should take care of it' for an answer...i.e., why don't I absorb Vitamin D and with megadoses, why now way over the limit....