The Harvard led Vitamin D and Omega 3 trial (VITAL), recently published findings showing a meaningful (22%) and statistically significant (p = 0.05, Hazard ratio = 0.78 95% CI = 0.61 – 0.99) reduction in the incidence of autoimmune disease in older adults taking 2000 IU (50 mcg) per day for 5 years. Read more.