Humanin
A tiny peptide made by your mitochondria that protects cells from stress and death. Humanin levels decline sharply with age — and that decline tracks closely with age-related disease.
Humanin is a 24-amino-acid peptide encoded in your mitochondrial DNA. It's cytoprotective — meaning it protects your cells from stress, inflammation, and programmed death (apoptosis). Discovered during Alzheimer's research, it's now studied as a potential key to understanding why we age.
Who's interested: Longevity researchers and biohackers interested in neuroprotection, mitochondrial health, and the biology of aging. This is a research-stage compound — not for beginners.
Dive deeper into the researchPotential side effects
- Injection site reactions (redness, swelling)
- Possible blood sugar effects (improves insulin sensitivity in animals)
- Unknown long-term safety — no human supplementation trials
What does Humanin do?
Humanin was discovered in 2001 by Japanese researchers studying Alzheimer's disease. They found that surviving neurons in Alzheimer's brains had higher levels of this peptide — it was literally protecting them from death.
Since then, research has shown that Humanin acts as a broad cytoprotective agent: it protects cells from oxidative stress, inflammation, and apoptosis (programmed cell death). It does this by interacting with multiple pathways — IGFBP-3, BAX, and STAT3 among them.
The aging connection is striking: Humanin levels decline by about 40% per decade after age 40. This decline correlates with increased susceptibility to age-related diseases — Alzheimer's, cardiovascular disease, type 2 diabetes, and sarcopenia.
Who uses it?
- Longevity researchers — studying mitochondrial-derived peptides as aging biomarkers
- Neuroprotection seekers — those concerned about cognitive decline
- Mitochondrial health — people already using NMN, CoQ10, or other mito-targeted compounds
- Advanced biohackers — comfortable with purely experimental compounds
What to know before trying
Humanin has zero human intervention trials. All evidence is from cell culture, animal studies, and human observational data (measuring natural levels). Dosing protocols are entirely extrapolated from animal research.
- Part of a family — Humanin belongs to the mitochondria-derived peptide (MDP) family alongside MOTS-c and the SHLP peptides
- Analogue HNG is more potent — researchers often use [Gly14]-Humanin (HNG), a synthetic analogue 1000x more potent than native Humanin
- Natural levels can be measured — some specialty labs offer Humanin level testing, though reference ranges aren't well established
- Not widely available — fewer peptide vendors carry Humanin compared to more popular peptides
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Get early accessFrequently Asked Questions
What is Humanin and why is it important for aging?
Humanin is a 24-amino-acid peptide made by your mitochondria that protects cells from stress, inflammation, and death. It was discovered in Alzheimer's research when scientists found it protecting surviving neurons. Humanin levels decline roughly 40% per decade after age 40, tracking closely with age-related disease risk.
Is Humanin the same as MOTS-c?
No, but they're related. Both are mitochondria-derived peptides (MDPs) encoded in mitochondrial DNA, but they work through different mechanisms. MOTS-c activates AMPK for metabolic benefits. Humanin is cytoprotective — it directly prevents cell death and reduces inflammation. They may be complementary.
Can I increase Humanin naturally?
Exercise increases circulating Humanin levels. Caloric restriction also appears to preserve Humanin levels with age. Mitochondrial health interventions (CoQ10, NMN) may indirectly support Humanin production, though this hasn't been directly studied.
Are there human trials for Humanin?
No human intervention trials have been published. Evidence comes from cell culture, animal models, and observational studies measuring natural Humanin levels in humans. Observational data shows lower levels are associated with Alzheimer's, diabetes, cardiovascular disease, and sarcopenia.
How it works in your body
- Anti-apoptotic — binds to and neutralises BAX, a protein that triggers programmed cell death
- IGFBP-3 interaction — binds IGFBP-3 in the bloodstream, modulating IGF-1 signaling and cell survival
- STAT3 activation — activates the STAT3 pathway, promoting cell survival and reducing inflammation
- Insulin sensitisation — improves insulin signaling in animal models, similar to MOTS-c
- Neuroprotection — protects neurons from amyloid-beta toxicity (the protein implicated in Alzheimer's)
Animal evidence highlights
- Mice treated with HNG (potent Humanin analogue) showed protection against Alzheimer's-like pathology
- Improved insulin sensitivity and reduced atherosclerosis in animal models
- Protected against ischemia-reperfusion injury in cardiac tissue
- Reduced age-related muscle loss (sarcopenia) in aged mice
Side effects & safety
No human safety data exists for supplemental Humanin. Based on animal studies:
- Generally well-tolerated in animals — no major adverse effects reported in rodent studies
- Injection site reactions — expected with subcutaneous administration
- Theoretical cancer concern — as a cell-survival peptide, there's a theoretical risk of protecting cancer cells from apoptosis, though no evidence supports this
- Unknown drug interactions — no interaction data available
Who should avoid it: People with active cancer (theoretical anti-apoptotic concern), pregnant or breastfeeding women, and anyone uncomfortable with purely preclinical compounds.
Which labs to monitor
- Fasting glucose & insulin — Humanin affects insulin sensitivity
- hsCRP — anti-inflammatory effects should show up here
- IGF-1 — Humanin interacts with IGF-1 signaling
- Cognitive testing — baseline and follow-up if neuroprotection is your goal
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