Verified July 2026 · Cited to primary sources

Humanin: Evidence Grade D. Animal studies only, unproven in humans.

Grade DResearch-onlySafety: amber

The honest verdict

Humanin is one of the more scientifically interesting peptides here: a genuine mitochondrial-derived signaling molecule with a strong, consistent neuroprotective story in cells and animals, plus suggestive human biomarker data linking low levels to Alzheimer's. But interesting biology is not proven benefit. No human neuroprotection trial has been completed, the efficacy rests on mouse models that often fail to translate, and there is no human safety data for injecting it. Promising research target, not a proven treatment.

Humanin at a glance

Class
Mitochondrial-derived peptide (24 amino acids)
Mechanism
Humanin is a 24-amino-acid peptide encoded within the mitochondrial 16S rRNA (MT-RNR2) gene. It functions as a cytoprotective and neuroprotective signaling molecule, suppressing apoptosis and protecting cells against a range of stresses. In neurons it near-completely blocks cell death induced by Alzheimer's-related proteins and amyloid-beta, and it signals through pathways including STAT3, ERK1/2, and AKT. Circulating humanin declines with age, which has fueled interest in it as a longevity and stress-resistance peptide.
Also known as
Humanin, HN, MT-RNR2 peptide, HNG (Gly14-humanin), S14G-HN
Research applications
  • Alzheimer's disease and neuroprotection
  • Cognitive decline and memory
  • Longevity / healthspan
  • Metabolic and cardiovascular protection
  • Stress resistance
Forms
Subcutaneous injection (research), Intracerebroventricular (experimental, animal studies)
Legal status
Research-only
WADA (anti-doping)
Not specifically named on the WADA Prohibited List.
Evidence grade
Grade DAnimal studies only, unproven in humans

How we grade evidence

Every grade comes from a fixed A to F rubric: human-trial strength, not hype or affiliate status. Last verified July 6, 2026.

What is Humanin?

A tiny peptide encoded inside your mitochondrial DNA that acts as a cellular bodyguard, protecting neurons from Alzheimer-related damage in the lab. The cytoprotection story is strong in animals and cells, but no human neuroprotection trial has ever been completed.

Humanin is a 24-amino-acid peptide encoded within the mitochondrial 16S rRNA (MT-RNR2) gene. It functions as a cytoprotective and neuroprotective signaling molecule, suppressing apoptosis and protecting cells against a range of stresses. In neurons it near-completely blocks cell death induced by Alzheimer's-related proteins and amyloid-beta, and it signals through pathways including STAT3, ERK1/2, and AKT. Circulating humanin declines with age, which has fueled interest in it as a longevity and stress-resistance peptide.

How strong is the evidence for Humanin?

Humanin has a deep and consistent preclinical record but essentially no human efficacy data, which puts it at D. Its potent humanin analog S14G-HN prevented amyloid-beta-induced memory impairment in mice, [Gly14]-humanin protected spatial learning and memory in rats, and cell studies show it protecting neurons and synapses from Alzheimer-related insults. Humanin is also lower in the cerebrospinal fluid of Alzheimer's patients, which is suggestive biomarker evidence. But no completed human neuroprotection trial has been published, and the efficacy signal comes almost entirely from transgenic mouse and cell models, which have historically translated poorly to human dementia results. Strong biology, animal-only proof, so grade D.

Primary sources (2)

  1. Tajima et al. 2005, J Neurosci Res - A humanin derivative, S14G-HN, prevents amyloid-beta-induced memory impairment in mice (in vivo mouse study; S14G-HN prevented Abeta-induced spatial working memory impairment)
  2. Zarate et al. 2019, Front Aging Neurosci - Humanin, a Mitochondrial-Derived Peptide Released by Astrocytes, Prevents Synapse Loss in Hippocampal Neurons (preclinical cell/animal study; humanin prevented glutamate-induced dendritic atrophy and synapse loss)

What is Humanin used for?

Humanin is marketed for the goals below. See how it ranks against other peptides in each, by evidence, not hype.

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What does Humanin cost, and how do you access it legally?

Typical cost

$50 to $120 per 5 mg to 10 mg vial from research suppliers

Mid-range research-peptide pricing for a compound with strong animal data and zero completed human trials. You are funding a personal experiment, not a validated therapy.

No legal supervised access route right now.

Humanin has no compliant US route today. Vials sold "for research use only" are a gray-market fig-leaf, not a legal loophole, so we don't link them. If you pursue Humanin, do it with a licensed clinician, and re-check its legal status first.

Is Humaninsafe? Side effects & risks

Limited human safety data, no major documented harms

There is no meaningful human safety data for humanin. It is an endogenous peptide, which is sometimes taken to imply safety, but injecting synthetic humanin or its potent analogs at supraphysiologic doses has not been studied for safety in people, and its broad anti-apoptotic (cell-survival) activity is exactly the kind of signaling that warrants caution before assuming it is harmless long-term. It is sold strictly as a research chemical. Thin data, endogenous origin, unproven exogenous safety, so amber.

Medical disclaimer: This page is independent editorial information, not medical advice, and Best Peptide For That is not a medical provider. We do not provide dosing. Talk to a licensed clinician before starting, stopping, or changing any peptide or medication. Full medical disclaimer.

FAQ

Humanin FAQ

Does humanin protect the brain in humans?

Not proven. The neuroprotection is strong in cell and animal models, and Alzheimer's patients have lower humanin levels, but no completed human trial has shown it protects cognition. It remains a research target.

Is humanin good for longevity?

It is an active longevity research target because circulating levels drop with age and it protects cells from stress, but there is no human trial showing that supplementing it extends healthspan or lifespan. The evidence is preclinical.

Is humanin safe to inject?

Unknown. Humanin is made naturally in the body, but injecting synthetic humanin or its more potent analogs has not been studied for safety in people, and its strong cell-survival signaling warrants caution. It is sold only as a research chemical.

Is humanin FDA approved?

No. Humanin is not an approved drug and is not compoundable. It is available only as a research-grade peptide.

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How we grade the evidence →Are peptides safe? →FDA peptide status 2026 →

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