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  1. Vitamin D - Mayo Clinic

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

  3. Vitamin D Benefits (Plus Signs of Low Levels) - Verywell Health

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

  5. 15 Vitamin D3 Benefits and Best Uses for Your Health

  6. Vitamin D - The Nutrition Source

  7. Vitamin D 101 — A Detailed Beginner's Guide - Healthline

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

  9. Vitamin D - Office of Dietary Supplements (ODS)

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