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  1. Vitamin D - Mayo Clinic

  2. 8 Best Vitamin D Supplements for 2024 - Healthline

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

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

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

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

  7. 5 Best Vitamin D Supplements in 2024 - Medical News Today

  8. The Best Vitamin D Supplements, According to a Dietitian

  9. Vitamin D: Uses & Benefits - Cleveland Clinic