Vitamin D and fish oil supplements may help prevent autoimmune disease, study says CNNVitamin D and Fish Oil Supplements May Reduce Risk of Autoimmune Disease – Rheumatoid Arthritis, Psoriasis, and Thyroid SciTechDailyA Daily Vitamin D Supplement Can Help Prevent Autoimmune Disease, Huge Study Shows IFLScienceVitamin D Supplements Might Cut Your Odds for Autoimmune Diseases U.S.