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The National institue of Health says vitamin D "helps your body absorb calcium, one of the main building blocks for strong bones. Together with calcium, vitamin D helps protect you from developing osteoporosis, a disease that thins and weakens the bones and makes them more likely to break."

"shortages of vitamin D and calcium cause your bones to become fragile and break more easily. This condition is called osteoporosis. Muscles are also important for healthy bones because they help maintain balance and prevent falls. A shortage of vitamin D may lead to weak, painful muscles."

ods.od.nih.gov/factsheets/Vita…