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What are the best sources of vitamin D? Vitamin D deficiency is common in Americans. Forty-two percent of Americans are vitamin D deficient, according to a recent study by the National Health and Nutrition Examination Survey.
Vitamin D is necessary for proper mineral absorption and metabolism. Insufficient levels of vitamin D have been linked to osteoporosis, cavities and tooth decay, bone loss and bone fracture, heart disease, autoimmune disease, multiple sclerosis, high blood pressure, diabetes, cancer and other diseases.
