The U.S. Food and Drug Administration is moving toward allowing compounding pharmacies to produce more than a dozen injectable peptides that were banned because of potentially significant safety risks, the New York Growth factors and their peptide mimetics for treatment of traumatic brain injury ScienceDirect Is Dihexa an approved and safe treatment for cognitive impairment or neurodegenerative diseases such as Alzheimer disease? Frontiers Neurotoxicity mechanisms and clinical implications of six common recreational drugs