> High parathyroid hormone will increase [[calcium]] and lower phosphate. I regularly use at least two quarts of [[milk]] per day, in the past I have averaged a gallon a day, high [[calcium]] intake helps to compensate for low [[vitamin D]], but both [[vitamin D]] and [[calcium]] in the diet tend to lower parathyroid hormone, and the serum [[calcium]] level. Quite a few people are now recommending from 2000 to 6000 i.u. of vitamin D3 daily during the winter. > If your [[vitamin D]] was very low for a long time, I think your parathyroid glands probably enlarged, and might take some time to normalize under the influence of a generous amount of [[vitamin D]] and [[calcium]].