Humanin

Humanin is a real mitochondrial-derived peptide your own cells make — but the human evidence for it stops at observational correlation. Humanin supplementation has not been tested in any well-controlled human clinical trial, per the available research literature. What's sold online as an anti-aging injectable rests entirely on cell-culture and rodent studies plus a real but purely correlational finding that centenarians' offspring have higher circulating levels than average — not proof that giving yourself more of it does anything.

What it is

Humanin is a 24-amino-acid "mitochondrial-derived peptide" (MDP), encoded not in nuclear DNA but within the mitochondrial genome's 16S ribosomal RNA gene region. It was first identified in 2001 in a screen for factors that protected neurons from Alzheimer's-disease-related cell death. Since then it has been studied — almost entirely in cell culture and rodent models — for roles in cellular stress resistance, insulin sensitivity, and mitochondrial-nuclear signaling as a "mitokine."

What human evidence actually exists

The real human data are observational, not interventional: circulating humanin levels decline with age, and centenarians' offspring show measurably higher levels than age-matched controls in published research. This is a genuine, published association — but it says nothing about whether raising humanin levels in a given person through injection produces any benefit; it could just as easily be a marker of some other underlying process. Humanin supplementation has not been tested in any well-controlled clinical trial, per the available research literature — humanin does appear in some human studies, but as a measured biomarker, not as an administered therapeutic.

Why the animal and cell data don't transfer

Preclinical findings for humanin are genuinely interesting — neuroprotection in Alzheimer's disease models, improved insulin sensitivity in rodents, and biodistribution studies showing exogenous humanin given to rats concentrates in plasma with little reaching the liver and none detectable in brain or heart. None of this is nothing. But cell-culture and rodent results for peptides in this general category have repeatedly failed to predict human outcomes elsewhere on this site — and with no completed human trial for humanin specifically, there's no clinical bridge at all between the animal biology and the anti-aging claims made for the injectable product sold online.

How it compares to MOTS-c

MOTS-c, covered elsewhere on this site at Grade D, is a different mitochondrial-derived peptide with the same basic story: real, interesting biology, and a very wide gap between that biology and what's marketed. Humanin and MOTS-c are frequently sold and discussed together in the same longevity/biohacking circles, and the honest read is the same for both — genuinely novel science, with essentially no human efficacy or safety trial data to support the doses and claims attached to the retail product.