According to the NCCN Guidelines for Colorectal Cancer Screening, there is mixed evidence around the impact of vitamin D, calcium, folate, and aspirin on colorectal cancer risk. Join Dr. Reid Ness as he discusses considerations for recommending these supplements based on patient-specific factors. Dr. Ness is an Associate Professor of Medicine at Vanderbilt University Medical Center in Nashville, Tennessee, faculty with the Vanderbilt Ingram Cancer Center, and the Chairman of the committee that developed the colorectal cancer screening guidelines.