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  1. Vitamin D Regulation of Immune Function - PMC

  2. Vitamin D and the Immune System - PMC - PubMed Central (PMC)

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

  4. Vitamin D - Mayo Clinic

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

  6. Vitamin D’s Effect on Immune Function - PMC - PubMed Central …

  7. Vitamin D - The Nutrition Source

  8. The health effects of vitamin D supplementation: evidence from …

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

  10. Vitamin D and the immune system - PubMed