Humanin: uses, evidence and status | Inside Your Peptides

compound file

The answer, first. A 24-amino-acid peptide encoded inside mitochondrial 16S rRNA, found in 2001 by Japanese researchers screening for factors that keep neurons alive against Alzheimer toxicity. The strongest evidence is for neuroprotection against Alzheimer toxicity, graded D — animal or mechanism only.

Humanin was found because it kept neurons alive against a wide range of familial Alzheimer genes and amyloid-beta in culture ¹.

Cell and rodent work only. No human has been dosed with it. Every other use — insulin sensitivity and glucose, cognitive aging, lifespan and healthspan, retinal protection — grade D or E: animal or mechanism data with no controlled human outcome.

What it is used for

Every use graded on its own evidence, not the compound as a whole. 5 outcomes, ranked by what the human record supports.

#outcome · human · animal · gradewhat the best evidence actually shows

01Neuroprotection against Alzheimer toxicityno trial · cell and rodent workgrade DHumanin was found because it kept neurons alive against a wide range of familial Alzheimer genes and amyloid-beta in culture ¹. Cell and rodent work only. No human has been dosed with it.

02Insulin sensitivity and glucoseno trial · rat clamp studiesgrade DInfused into rat brain ventricles, humanin improved whole-body insulin sensitivity through hypothalamic STAT-3, lowered glucose in Zucker diabetic rats and cut hepatic triglyceride secretion ²⁹. Rodent clamps. No human dosing.

03Cognitive aginggenetic association only · aged micegrade DHumanin improved cognition in aged mice ³. A mitochondrial variant that lowers circulating humanin tracked with faster cognitive aging in a national sample of older adults ³. The human half is genetics, not treatment.

04Lifespan and healthspanlevels only · worm and mousegrade DOverexpressing humanin extended lifespan in C. elegans, and twice-weekly HNG improved metabolic healthspan markers in middle-aged mice ⁴. In people only levels were measured: centenarians' children carry higher circulating humanin ⁴.

05Retinal protectionno trial · cell culturegrade DHumanin protected human retinal pigment epithelial cells from oxidative injury in culture, which is the basis for the macular degeneration interest ⁵. Cell culture. No animal or human eye-disease outcome study.

gradewhat it means

ARegulatory approval, or multiple adequately-powered trials agreeing with each other

BAt least one well-powered human randomised trial, with the direction replicated

CSmall or open-label human trials only

DAnimal or mechanism data only, with no controlled human outcome

EA claim the human trials have already killed

How it works

The proposed mechanism, in three steps. A mechanism is a reason to run a trial, never a substitute for one.

1targetHumanin is translated from a short open reading frame inside the mitochondrial 16S rRNA gene and is released into circulation ¹⁴.

2signalIt signals through STAT3, shown in the hypothalamus, and blocks apoptosis in cells under stress ¹².

3effectStressed cells survive insults that would kill them. Circulating humanin falls with age and tracks IGF-I in rodents and people ²⁴⁷.

What it does not do

Claims the current record does not support. Worth knowing before you set expectations.

not supported by the evidence

Humanin slows human aging. No person has been given humanin in a published trial. Every longevity result is worm, mouse, or an association between blood levels and outcomes ⁴.
Low humanin causes age-related disease. Levels run lower in Alzheimer's, in MELAS and in ischaemic heart disease ⁴⁶¹⁰. Cross-sectional association. Direction of cause is unestablished.
Injected humanin reaches the brain. The rodent insulin work needed infusion directly into brain ventricles for the central effect ². No human distribution data exists.
The vial is what the studies used. Most rodent work used HNG, an S14G analogue chosen for potency, rather than native humanin ²⁴.

How it is used

What published protocols administered, and what the community reports doing. Descriptive on both counts, and never a recommendation.

routeSubcutaneous injection. Rodent work used intravenous, intraperitoneal and direct brain infusion, none of which transfers to a person.

formatLyophilised powder in vials, reconstituted with bacteriostatic water.

published dosesThere is no human dose, because no human has been dosed in a published study. Rodent work infused humanin continuously into brain ventricles, or gave intravenous analogue infusions during clamp studies ². The mouse healthspan work dosed the HNG analogue twice weekly from middle age ⁴.

human pharmacokineticsNo human pharmacokinetic data published.

reported conventionsAs reported on longevity and peptide forums, 2021-2026: a small daily subcutaneous amount run in short blocks, discussed far less often than MOTS-c. The thread volume is thin enough that no stable pattern is visible. Convention, not guidance.

commonly paired withMOTS-c SS-31

This site does not publish protocols to follow. The doses above are what studies administered or what users report, stated as facts about the literature and the market. How protocols are structured, mixing and storage and the reconstitution calculator cover the arithmetic.

What to expect

Where a trial measured it, the trial. Where only the community reports it, that is said out loud.

onsetNo trial measured onset, in any species, against a clinical endpoint. As reported: nothing specific. The claimed outcomes, neuroprotection and cell stress resistance, are not things a person can feel changing. That is part of why the reports are so sparse.

most common reportAs reported: no perceptible effect. This compound is bought on mechanism rather than on sensation.

adverse effectsNo trial has published adverse event rates, because no trial has dosed humans. As reported: injection site reactions, in a thin body of reports. Absence of reported harm from a niche compound is not a safety record.

the stop signalAs reported: people stop when a vial runs out. There is no published stopping rule and no marker to follow.

Approval and status

What regulators and sport bodies have actually said, separately from what the evidence shows.

approvalNot approved anywhere. Sold as a research chemical.

FDANot named on the FDA compounding risk list. Every registered humanin study is observational, measuring blood or tissue levels.

sport [WADA]Not named on the List. Caught by S0, non-approved substances.

sold asresearch chemical

Check the vial

The grade above describes a molecule studied under controlled conditions. It says nothing about the powder in a particular vial.

That gap is the one part of this market a reader can actually close. How to read a certificate of analysis covers the five measures in five minutes, and the 2026 audit grades vendors on the documents they publish against a rubric printed in full.

Questions we get

What is Humanin used for?

On the human record, nothing. It is sold for neuroprotection, metabolic health and longevity. The support is preclinical.

Humanin kept neurons alive against Alzheimer insults in culture ¹, improved insulin sensitivity in rats ², improved cognition in aged mice ³, and extended lifespan in worms ⁴. No human has been given it in a published study.

How is Humanin used?

Descriptively, and not as guidance: subcutaneous injection from a reconstituted vial, in small daily amounts run in short blocks. That comes from a thin body of forum reports, not from a study. No human dose exists in the literature.

The rodent work used brain-ventricle infusion, intravenous analogue infusion, or twice-weekly HNG in mice ²⁴.

How long does Humanin take to work?

Unknown, and unmeasured. No trial has dosed a person, so no onset has been recorded against any endpoint. In mice, cognitive and metabolic changes were read after weeks of repeated dosing ³⁴. Community reports describe nothing consistent, which is what you would expect from outcomes nobody can feel.

Has humanin ever been given to a person?

Not in a published trial. Every registered humanin study on the clinical trials register is observational ⁸. They measure humanin in blood or heart tissue in cardiac surgery, kidney injury or Alzheimer's cohorts.

The dosing studies are rodent ²⁴. That is the whole answer, and it is the reason the clinical grade on this page reads animal only.

Is humanin the same as HNG?

No. HNG is S14G-humanin, an analogue engineered for potency, and it is what most of the rodent dosing work actually used ²⁴. Native humanin and HNG are different molecules with different potency. A vial labelled humanin is not the compound that produced the mouse healthspan results.

References

Hashimoto Y, Niikura T, Tajima H, et al. A rescue factor abolishing neuronal cell death by a wide spectrum of familial Alzheimer's disease genes and Abeta. Proc Natl Acad Sci U S A. 2001;98:6336-6341. PMID 11371646
Muzumdar RH, Huffman DM, Atzmon G, et al. Humanin: a novel central regulator of peripheral insulin action. PLoS One. 2009;4:e6334. PMID 19623253
Yen K, Wan J, Mehta HH, et al. Humanin prevents age-related cognitive decline in mice and is associated with improved cognitive age in humans. Sci Rep. 2018;8:14212. PMID 30242290
Yen K, Mehta HH, Kim SJ, et al. The mitochondrial derived peptide humanin is a regulator of lifespan and healthspan. Aging [Albany NY]. 2020;12:11185-11199. PMID 32575074
Sreekumar PG, Hinton DR, Kannan R. Mechanisms of protection of retinal pigment epithelial cells from oxidant injury by humanin and other mitochondrial-derived peptides. Redox Biol. 2020;37:101663. PMID 32768357
Rodriguez-Esparragon F, et al. Insights into the biomarker potential of humanin and MOTS-c expression and telomere length in Alzheimer's disease. Int J Mol Sci. 2025;26. PMID 41303353
Lee C, Wan J, Miyazaki B, et al. IGF-I regulates the age-dependent signaling peptide humanin. Aging Cell. 2014;13:958-961. PMID 25040290
ClinicalTrials.gov. Humanin isoforms in cardiac muscle and blood plasma and major complications after cardiac operation, NCT03431844. Observational, 106 participants, completed. Accessed 24 Aug 2026. clinicaltrials.gov
Gong Z, Su K, Cui L, et al. Central effects of humanin on hepatic triglyceride secretion. Am J Physiol Endocrinol Metab. 2015;309:E283-E292. PMID 26058861
Zhloba AA, Subbotina TF, Shipaeva KA. The level of circulating humanin in patients with ischemic heart disease. Klin Lab Diagn. 2018;63:466-470. PMID 30726649

Inside Your Peptides is published by the owners of the next lab, a vendor graded elsewhere on this site. We sell nothing here, and this page carries no vendor link. Grades follow the published criteria in our editorial policy — never referral terms. Research and education only. Not medical advice.