What role does Vitamin D Test play in Haut?

A Vitamin D test measures 25-hydroxyvitamin D levels in the blood. For skin, vitamin D plays a role in cell proliferation, immune modulation, and barrier function. Low levels are associated with dry skin, psoriasis, or eczema, but the test alone cannot diagnose any skin disease. The evidence for a direct benefit of testing to improve skin health is weak and mostly based on observational studies. The test can serve as a general wellness screening, but it does not replace a medical evaluation for specific skin conditions. Results vary seasonally and are influenced by sun exposure, diet, and genetics. Any deficiency should be discussed with a doctor before starting supplementation.