The N-terminal tryptophan and three glycine residues give the molecule a flexible backbone that has not, in the published literature, been shown to adopt a stable secondary structure under physiological conditions
However, this cost-saving hack creates a serious safety issue
Sikiric et al., 2020b), along with suggested significance of NO-synthase and the basal formation of NO in stomach mucosa, greater than that seen in other tissues (Whittle et al., 1992), BPC 157 exhibits a general, effective competing with both L-arginine analogs (i.e., L-NAME) and L-arginine (Sikiric et al., 2014)
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In the STEP 1 clinical trial and its follow-up study, patients regained two-thirds of their lost weight within one year of stopping semaglutide