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  1. Vitamin D - Mayo Clinic

  2. Vitamin D: Benefits, Sources, Deficiencies - Healthline

  3. Vitamin D - Health Professional Fact Sheet - Office of Dietary ...

  4. Vitamin D - Wikipedia

  5. Vitamin D: Benefits, deficiency, sources, and dosage - Medical …

  6. 23 Foods Rich in Vitamin D to Enjoy Under the Sun - Verywell …

  7. VITAMIN D - Uses, Side Effects, and More - WebMD

  8. Vitamin D Deficiency: Causes, Symptoms & Health Risks - WebMD

  9. Vitamin D Deficiency: Causes, Symptoms & Treatment - Cleveland …

  10. Vitamin D - The Nutrition Source