Last revision: 08-13-22   By Eugene L. Heyden, RN     Vitamin D protects against Cancer.  Vitamin D protects against autoimmune disease.  Vitamin D protects against Alzheimer’s disease, against Parkinson’s disease, and against multiple sclerosis.  It protects against so many diseases.  So, why would it not protect against heart disease?  The answer is “it does.”…