Significantly lower levels of all evaluated biomarkers were observed in patients with inactive IBD as compared to healthy controls, including Selenoprotein P (SMD −1.19, p = 0.01), albumin (SMD −0.56, p < 0.001), R–SH (SMD −0.55, p = 0.002), and transferrin (SMD −0.32, p = 0.002) (Table 1). Here, SELENOP is linked to inflammatory bowel disease.