Dihexa Research Grade Neurotrophic Molecule 20 mg PRG DIHEXA Research Compound Capsules 10mg Pepsynth Labs 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 Follow for more info on how to optimize your health. Dihexa gets misunderstood because people expect it to feel like stimulation. That's not what it's about. This is about adaptation, not activation.