doi:10.1016/S0736-0266(03)00110-4 Goldstein AL, Hannappel E, Sosne G, Kleinman HK
During the procedure some people may feel some discomfort with sensations of pulling, pinching, tugging, tingling, and cold
However, consumers must remember that these novel compounds remain strictly classified as investigational research materials locally
Neither has been tested in humans, and both carry significant unknowns -- Dihexa with its retracted publication and oncological pathway concerns, PE-22-28 with its untested cognitive effects and potential seizure susceptibility
"How Nature builds the pigments of life" (PDF)
(Most other peptides break down in the gut quickly and need to be injected to deliver an active drug.) Regulatory and safety status: KPV is not currently FDA approved for use and cannot be prescribed by an accredited, licensed clinician