After TT 8 years ago and damaged parathyroids I was put on Alphacalcidol. This was reduced to 0 .25mg in July. My Vitamin D has now gone down from 40 to 24. Could this be due to the reduction in Alphacalcidol. The Endo has now put me on AdCal D3, 1 a day as well. Is anyone else on this combination? I have a feeling that my GP put me on Adcal D3 some years ago but the Endo at the time took me off it and said I shouldn't be taking it as I was on Alphacalcidol. I am really confused about it all, and worried about my Vitamin D levels/calcium etc. Can't really see 1 tablet a day doing much good and he doesn't want to see me for 6 months. Can anyone offer any advice?