Poor gut health has always been a problem for pork producers. Traditionally anti-biotics were used to improve gut health but the use of anti-biotics has recently come under scrutiny so alternative methods to improve gut health have come into demand. This study looks for some alternative methods to improve gut health. The first trail involved a diet enhanced with zinc and copper and a control diet, this test consisted of 180 piglets, and they were analyzed for growth performance, circulating cytokines levels and gut microbiota. There was no difference found in growth performance between the two groups, there was no difference in circulating cytokine levels other than cortisol being higher in pigs in the test diet. Enhanced growth performance of the newly weaned piglets fed high dietary Zn and Cu during the first two weeks post-weaning appears mediated via changes in gut microbiota as well as a reduced cortisol response following an immune challenge. The second study involved feeding 129 piglets a diet of galactomannan oligosaccharides (GMOS) or a control diet and then they were tested on growth performance, immune response and intestinal microbiota.Results showed that inclusion of GMOS at 0.3% appeared to alter the compositions of both ileal and colonic microbiota. These results suggest that dietary GMOS was able to increase humoral immunity and alter the compositions of microbiota of newly-weaned pigs, while reducing feed intake and growth performance during the first week post-weaning.