Every time I try to take vitamin D3 pills, even 400 mgs, I get so sick and sore and stressed in my lower GI tract that for 24 hours I am in a moaning and incapacitated state. Just unbelievable soreness and the whole episode exhaust me for another couple of days afterwards. You can't sleep through this state either. My family doc told me today that Vitamin D absorption problems are not that uncommon. I was relieved to hear that she believed me about what happens every time I try to take Vitamin D. But, then we couldn't figure out how to get this into my system some other way in amounts that I need. In the last two years my Vitamin d readings on my blood tests have been super low...even lower than the lowest normal range. Every time. I asked if there was a shot you you get of Vitamin D and she said she hadn't heard of any. Any helpful advice on how I can get and take Vitaimn D3 in adequate amounts without putting my self in that 24 hour intestinal pain torture?