Humanin is a 24 amino acid peptide with an unusual origin: it is encoded inside your mitochondrial DNA rather than the DNA in the cell nucleus. Mitochondria are the structures that produce your cells energy, and they carry their own small separate genome.
It was discovered in 2001 in an unexpected way. Researchers were studying brain tissue from Alzheimer's patients and looking for anything that protected neurons from dying. Humanin turned up as a factor that did exactly that, which is where its name comes from.
Since then it has become the founding member of a family called mitochondrial-derived peptides. The idea behind them is that mitochondria are not just power plants but also send signals to the rest of the body about how stressed they are. MOTS-c, which is also on this site, is another member of the same family.
Humanin is entirely a research compound. There are no human trials of any kind, and everything known about it comes from cells, animals, and observations of natural levels in people.
For educational and research purposes only. Never use any peptide or substance based on information found here — always consult a licensed healthcare professional before making any medical or health-related decision.
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Humanin has genuinely interesting science behind it and essentially no human evidence, and it is important to hold both facts at once.
The animal work is real. Increasing humanin in C. elegans extends lifespan, and the effect depends on daf-16/Foxo, a pathway well known in longevity biology, which suggests it is working through a real mechanism rather than a fluke. Treating middle aged mice twice weekly with the analogue HNG improved metabolic healthspan markers and reduced inflammation.
The human data is observational, which means researchers measured levels rather than giving anyone the peptide. The most cited finding comes from work at USC, where the children of centenarians were found to have significantly higher humanin levels than age matched controls. Circulating levels also decline with age and are inversely associated with markers of metabolic disease, cardiovascular disease, and cognitive decline. Levels are lower in Alzheimer's disease and in the mitochondrial disorder MELAS.
That is a correlation, not proof of cause. Higher humanin might contribute to healthy aging, or healthy aging might simply produce more humanin, and current data cannot separate those.
No human efficacy or safety trial has been completed. This is one of the most speculative entries on the site.