A study in the journal Menopause found that some older women who take supplements may be getting too much vitamin D and calcium, which could cause health problems such as kidney stones. In a randomized study of 142 women ages 57 to 90, nearly 9% had excess calcium in their blood while 32% had too much calcium in their urine. Checking blood and urine calcium levels before supplements are started and three months afterward could reduce the risk, researchers said.

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