Rachael Link is a registered dietitian and health writer based in San Francisco. She completed her undergraduate degree at the University of Central Missouri and holds a master’s degree from New York ...
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What Are the Normal Vitamin D Levels by Age?
Most adults need at least 600 IU of vitamin D every day to maintain healthy levels. Blood levels of vitamin D below 12 ng/mL are considered deficient and can be harmful to health. Vitamin D helps the ...
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