Techmed Scientists created a peptide one million times stronger than the brain's natural growth factor sound dramatic. But strength in biology does not always mean better or safer. The brain's key 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 DIHEXA Beverly Hills Rejuvenation Center 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