The purpose of this study is to investigate the outcomes of a 60-day trial of Rice Bran Arabinoxylan Compound (RBAC) among adults. Specifically, subjects will participate in a two-group, randomized intervention that is based on a nutritional supplement made from a water soluble extract of rice bran that has been partially hydrolyzed by the action of a natural enzyme complex extracted from Shitake mushroom. One group will take 1 gram/day and the other group will take 3 gram/day to compare differences in outcomes between the two groups. We hypothesize that the 3 gram/day condition will demonstrate faster increases in outcomes compared to the 1 gram/day condition. The primary outcomes for this study will be Natural Killer (NK) cell activity, cytokines, total bilirubin, creatinine, and liver function tests. These outcomes will be compared between those subjects enrolled in the two treatment groups before and after 60 days.