National Institutes of Health. National Institutes of Arthritis and Musculoskeletal and Skin Diseases. Calcium and vitamin D: important at every age. https://www.bones.nih.gov/health-info/bone/bone-health/nutrition/calcium-and-vitamin-d-important-every-age. Updated October 2018. Accessed November 2019.
National Institutes of Health. National Institutes of Health Office of Dietary Supplements. Calcium fact sheet for health professionals. https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/. Updated October 16, 2019. Accessed November 2019.
Calcium/vitamin D. National Osteoporosis Foundation. https://www.nof.org/patients/treatment/calciumvitamin-d/. Updated February 26, 2018. Accessed November 2019.
National Institutes of Health. Office of Dietary Supplements. Vitamin and mineral supplement fact sheets. https://ods.od.nih.gov/factsheets/list-VitaminsMinerals/.
Accessed November 2019.