Dementia prevention: 9 behaviors could cut your risk by 35 percent Vox 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 AngIV Analog Dihexa Rescues Cognitive Impairment and Recovers Memory in the APP PS1 Mouse via the PI3K AKT Signaling Pathway Is Dihexa an approved and safe treatment for cognitive impairment or neurodegenerative diseases such as Alzheimer disease? EllieMD Dihexa