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  1. Vitamin D - Mayo Clinic

  2. How Much Vitamin D Do Women Need per Day? - Verywell Health

  3. Vitamin D Deficiency > Fact Sheets - Yale Medicine

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

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

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

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

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

  9. Vitamin D - The Nutrition Source

  10. Vitamin D deficiency - Mayo Clinic