RCT shows vitamin D does not improve psoriasis. 122 mild PSO pts (PASI=3.1) w/ mean low vit D levels 14.9 ng/mL; randomized to vit D (20KIU/wk) or placebo. At 4 mos, vit D levels rose to 30 w/ Rx, but no signif improvement in PASI change, MD global or DLQI https… https://t.co/OI5v1y5t0u