What Are the Normal Vitamin D Levels by Age?
Vitamin D levels can be measured with a blood test. This test can indicate whether you have adequate levels, are at risk of avitamin D deficiency, or have levels that are too high. Levels that are too low or too high could be harmful to your health. Most adults need at least 15 micrograms (mcg)—or 600 international units ( IU)—ofvitamin Ddaily to maintain healthy levels.The amount recommended for children and older adults depends on age....