In particular, GLP‐1 has potent effects on blood glucose by either stimulating glucose induced insulin release or inhibiting glucagon secretion (Drucker, 2018; Holst, 2019; Müller et al., 2019), both of which limit hepatic glucose production, which has been associated with hyperglycaemia in type 2 diabetic patients. Here, GCG is linked to type 2 diabetes mellitus.