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Role of Skin in Vitamin D Synthesis01:23

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The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
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[Vitamin D for daily practice].

A L Aguilar Shea1, O Muñoz Moreno-Arrones2, D Palacios Martínez3

  • 1Medicina Familiar y Comunitaria, Centro de Salud Puerta de Madrid, Atención Primaria de Madrid, Alcalá de Henares, Madrid, España.

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Summary

Vitamin D is essential for calcium and phosphorus metabolism, primarily sourced from sun exposure. Low levels necessitate reviewing sun habits, diet, and considering supplementation if deficiency is suspected.

Keywords:
Deficiencia vitamina DLuz solarRayos ultravioletaSunlightUltraviolet raysVitamin DVitamin D deficiencyVitamina D

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Dermatology

Background:

  • Vitamin D, a fat-soluble vitamin, is crucial for calcium-phosphorus metabolism.
  • Vitamin D receptors are widespread, indicating diverse physiological roles.
  • Primary sources include UV sun radiation, diet, and supplementation, with skin producing 90% from solar exposure.

Purpose of the Study:

  • To review the sources, functions, and assessment of Vitamin D.
  • To highlight the importance of sun exposure and dietary intake.
  • To discuss the assessment and management of Vitamin D deficiency.

Main Methods:

  • Literature review on Vitamin D metabolism and sources.
  • Discussion of diagnostic methods for Vitamin D levels.
  • Analysis of recommendations for supplementation and screening.

Main Results:

  • The skin is the primary source of Vitamin D (90%) via UV radiation.
  • Low Vitamin D levels (<20 ng/ml) indicate insufficiency.
  • Universal Vitamin D screening is not recommended unless deficiency is suspected.

Conclusions:

  • Vitamin D status is influenced by sun exposure, diet, and supplementation.
  • Assessment of 25-hydroxycholecalciferol is key for diagnosing deficiency.
  • Targeted assessment is preferred over universal screening for Vitamin D.