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Reviewed by Melinda Ratini on February 06, 2020
National Osteoporosis Foundation: "Calcium/Vitamin D."<br><br>University of Maryland Medical Center: "Vitamin D."<br><br><br><br>Mayo Clinic: "Vitamin D."<br>Vitamin D Council: "How do I get the vitamin D my body needs?"<br><br>NIH Office of Dietary Supplements: "Vitamin D."<br><br>Kidshealth.org: "Vitamin D."<br><br>PubMed: "Vitamin D for Influenza."<br><br>ScienceNews: "Vitamin D is a flu fighter."<br><br>Harvard T.H. Chan School of Public Health: "Vitamin D and Health."
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