Your question about whether or not your seemingly normal calcium level will wind up  too high if you start supplementing with vitamin D, is a good one, MERF. (Not everyone is aware of the important relationship between vitamin D and calcium to our bodies, so you are way ahead of the game! )   But, the relationship is not as simple as it may seem...   Vitamin D deficiency causes a decrease in ionized calcium in blood. This leads to an increase in the production and secretion of parathyroid hormone (PTH).   PTH stimulates the mobilization of calcium from the skeleton, reduces loss of calcium from the kidneys, and causes increased excretion of phosphorus from the kidneys. The result is a normal fasting serum calcium, and a low, or low-normal, serum phosphorus. So, vitamin D deficiency is characterized biochemically by either a normal, or low-normal, serum calcium with a low-normal, or low-fasting, serum phosphorus and an elevated serum PTH.   You will not wind up with too much calcium in your bloodstream by receiving the needed vitamin D, because, right now, your vitamin D deficiency is causing a cascade of hormonal activity that is taking calcium from your bones in order to maintain a chemical balance in your blood-and, you sure don't want this "borrowing" of calcium from your bones to continue!   Be well- Hope