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Not getting enough vitamin D also called a vitamin D deficiency can cause your bones to become thin brittle bent or bowed during growth. More study is needed to understand how vitamin D levels affect chronic illness. The recommended amount of vitamin D a day for adults is 600 international units also called IU.
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/vitamin-d-deficiency/faq-20058397
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