Nootropics, substances that enhance cognitive function, have received attention for their potential therapeutic applications in various neurological disorders, including Alzheimer’s disease (AD). Among them, P-21, a novel peptide from adrenocorticotropin (ACTH), has shown promise due to its potential neuroprotective and cognitive-enhancing properties. What is peptide P-21? P-21 is a peptide fragment from adrenocorticotropin, a hormone involved in the stress response. …