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

  2. Vitamin D - Mayo Clinic

  3. 15 Vitamin D3 Benefits and Best Uses for Your Health

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

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

  6. Vitamin D2 and Vitamin D3: Benefits, Sources, Recommendations - Health

  7. Vitamin D: Benefits and How Much You Need - Cleveland Clinic …

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

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

  10. Vitamin D - NHS