Humanin

Humanin is one of the most fascinating molecules to emerge from mitochondrial biology. Discovered in 2001 while researchers were searching for factors that protect neurons from Alzheimer's disease, it turned out to be encoded in mitochondrial DNA—a tiny protein made by mitochondria themselves. This 24-amino acid peptide acts as a powerful survival signal, protecting cells from apoptosis (programmed death) triggered by various stresses including amyloid-beta (Alzheimer's), oxidative damage, and ischemia. Humanin binds to receptors on cell surfaces, activating intracellular signaling pathways (including STAT3) that suppress death programs. Remarkably, circulating Humanin levels decline with age and correlate with metabolic health—people with higher Humanin tend to have better insulin sensitivity and less cardiovascular disease. The synthetic analog S14G-Humanin (HNG) is 1000x more potent than natural Humanin. Research is exploring its potential for neurodegenerative diseases, diabetes, cardiovascular protection, and longevity. Humanin represents a paradigm shift: the idea that mitochondria don't just make energy, they make signaling molecules that influence aging and disease throughout the body.