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Vitamin D Regulation of Immune Function - PMC
Vitamin D and the Immune System - PMC - PubMed Central (PMC)
Vitamin D Deficiency: Causes, Symptoms & Treatment - Cleveland Clinic
Vitamin D - Mayo Clinic
Vitamin D: Benefits, Sources, Deficiencies - Healthline
Vitamin D’s Effect on Immune Function - PMC - PubMed Central …
Vitamin D - The Nutrition Source
The health effects of vitamin D supplementation: evidence from …
Vitamin D - Health Professional Fact Sheet - Office of Dietary ...
Vitamin D and the immune system - PubMed