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  1. Vitamin D - Mayo Clinic

  2. Vitamin D: Benefits and How Much You Need

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

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

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

  6. Vitamin D: Benefits, deficiency, sources, and dosage

  7. Vitamin D - The Nutrition Source

  8. The Truth About Vitamin D’s Health Benefits - WebMD

  9. Vitamin D: Benefits, Sources, Deficiency | Supplements