If you take thyroid med for Hashimoto's (thyroid problems are very common), and you took too much, some studies show that it can result in lower bone density. You would want to make sure that your TSH levels were not out-of-whack. As to calcium, studies of people who eat a lot of calcium in their diets have apparently not shown any increase in calcium plaques, but taking high calcium supplements may be associated with plaques because the body is not excreting the calcium. You can find more information in a search. My doctor told me to get all my calcium from diet. Hope you find something that works for you.