AngIV Analog Dihexa Rescues Cognitive Impairment and Recovers Memory in the APP PS1 Mouse via the PI3K AKT Signaling Pathway Growth factors and their peptide mimetics for treatment of traumatic brain injury ScienceDirect Dihexa Research Grade Neurotrophic Molecule 20 mg PRG It seems as if everywhere you turn, celebrities and influencers are talking up peptides. But what exactly is a peptide? Link to the full story in the comments.