A
AICAR
Full name: 5-Aminoimidazole-4-carboxamide ribonucleotide
A cell-permeable AMPK (AMP-activated protein kinase) activator studied as a metabolic exercise mimetic. Preclinical research in animals showed improvements in endurance, fat oxidation, and insulin sensitivity without physical exercise. Not a peptide in the classical sense but frequently referenced in peptide research circles.