If the peptide promoted cancer, this extensive research would have generated at least some concerning signals
J Am Soc Nephrol (2004) 15(8):213951
Polymorphism of -GCS Alterations in GSH levels are associated with a wide variety of pathologies, including cancer, HIV, lung disease and Parkinsons disease (PD)

the chromatographic ion exchange resin is chosen depending on the specific GLP-1 peptide to be purified and the conditions employed, such as pH, buffer, ionic strength etc., which are known to the person skilled in the art (that is, typically, pH below the isoelectric point (pl) of the GLP-1 peptide for cation exchange resins and pH above pl of the GLP-1 peptide for anion exchange resins, a sufficient buffer strength to maintain the desired pH, and a sufficiently low ionic strength possibly induced by the salt concentration), and includes but is not limited to Sepharose resins, Sephadex resins, Streamline resins, and Source resins from Amersham-Pharmacia Biotech, HyperD resins, Trisacryl resins, and Spherosil resins from BioSepra, TSKgel resin a solution consisting essentially of an organic modifier, water, optionally a salt component and optionally a buffer is intended to mean a solution containing one or more organic modifiers, water, one or more salt components or no salt component and one or more buffers or no buffer, and optionally one or more further conventional components which the person skilled in the art would consider adding, according to conventional ion exchange chromatography processes

Research indicates that individuals with diabetes often have lower levels of glutathione, which can exacerbate oxidative damage and lead to complications such as neuropathy, retinopathy, and cardiovascular diseases
Monnier, M., & Henneberg, H