vitamin D. The NIH explains that vitamin D status is usually measured through a blood test for 25-hydroxyvitamin D.
This is important because guessing can be misleading. Feeling tired does not automatically mean someone has low vitamin D. At the same time, taking a high-dose supplement without testing can increase the risk of taking more than the body needs.
Image Placement 4: After this section
Caption: A blood test can help show whether vitamin D levels are low, adequate, or too high.
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Realistic close-up of a doctor
