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  1. Vitamin D - Mayo Clinic

  2. Mayo Clinic Q and A: How much vitamin D do I need?

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

  4. How Much Vitamin D Should You Take For Optimal Health?

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

  6. Vitamin D Deficiency: Causes, Symptoms & Treatment - Cleveland Clinic

  7. Vitamin D - Consumer - Office of Dietary Supplements (ODS)

  8. What Vitamin D Dosage Is Best? - Healthline

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

  10. Normal vitamin D levels by age, sources, and toxicity - Medical News Today