Supplementation for 5 years with vitamin D3 +/- n-3 fatty acids reduced incident autoimmune disease by 25-30% in older adults vs. those who received neither supplement. The effect of vitamin D3 appeared stronger after 2 years @RheumNow #ACR21 Abst#0957 https://t.co/uOwNyjxEoG https://t.co/S5kIM4kj6L