GHK Cu Copper Peptide Benefits, Uses & Safety Intra V Dihexa (PNB 0408) is a hepatocyte growth factor mimetic studied in animal models for synaptogenic signaling and neuroplasticity pathways. RUO. Not for human consumption. #Dihexa #Neuroplasticity #ResearchOnly #NootropicScience #KimeraChems Dihexa (also known as PNB 0408) is an experimental small molecule derived from angiotensin IV. It was engineered to cross the bloodbrain barrier and has shown synaptogenic effects in preclinical models. The often quoted In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega