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  1. Vitamin D - Mayo Clinic

  2. Vitamin D3 - Uses, Side Effects, and More - WebMD

  3. Vitamin D3 Uses, Side Effects & Warnings - Drugs.com

  4. 15 Vitamin D3 Benefits and Best Uses for Your Health

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

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

  7. Vitamin D - The Nutrition Source

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

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

  10. Vitamin D deficiency - Mayo Clinic