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Peptide comparison

MOTS-c vs humanin

The two most-studied mitochondrial-derived peptides. Both encoded in mitochondrial DNA, both decline with age — but MOTS-c is a metabolism peptide and humanin is a cell-survival peptide.

Editorially reviewed Peer-reviewed citations Research use only
MOTS-c
16 aa · AMPK activator
  • Improves insulin sensitivity & glucose uptake
  • Boosts fatty-acid oxidation, mitochondrial biogenesis
  • Studied for metabolism, exercise, healthy aging
vs
Humanin
21–24 aa · anti-apoptotic
  • Inhibits BAX-mediated cell death; activates STAT3
  • Strongest data in neuroprotection (Alzheimer's models)
  • Also studied in cardioprotection & cytoprotection

Side-by-side comparison

AttributeMOTS-cHumanin
Discovered2015 (Lee et al., USC)2001 (Hashimoto et al., Keio Univ.)
Length16 amino acids21–24 amino acids (humanin and analogs)
Encoded in12S rRNA region of mitochondrial DNA16S rRNA region of mitochondrial DNA
Primary mechanismAMPK activation → glucose uptake, fatty-acid oxidationAnti-apoptotic signaling via BAX inhibition; STAT3 activation
Main research focusMetabolism, insulin sensitivity, exercise, longevityNeuroprotection (Alzheimer's), cardioprotection, cytoprotection
Effect on glucoseLowers fasting glucose, improves insulin sensitivityMild improvement in insulin sensitivity in some models
Declines with ageYes — strongly correlated with metabolic agingYes — falls ~30–50% from young adulthood to old age
Regulatory statusResearch chemical only — not FDA approvedResearch chemical only — not FDA approved
Typical research dose0.1–15 mg/kg in animals; ~5–10 mg/week in protocolsHighly variable; analogs like S14G-humanin are far more potent

MOTS-c at a glance

MOTS-c is a 16-amino-acid peptide that activates AMPK, the cell's master energy sensor. Downstream this drives glucose uptake, fatty-acid oxidation, and mitochondrial biogenesis — which is why MOTS-c is described as an exercise-mimetic peptide. Most of the data is metabolic: insulin sensitivity, fatty liver, sarcopenia, exercise capacity.

Humanin at a glance

Humanin is a 21–24-amino-acid peptide first identified in surviving Alzheimer's-affected brain regions. Its signature mechanism is anti-apoptotic: it binds and inhibits BAX, blocking mitochondrial-mediated cell death. Most of its research footprint is in neuroprotection, cardioprotection, and cell survival under stress.

Which one should you research?

  • Metabolic & exercise focus → MOTS-c has the deeper dataset.
  • Neuroprotection / age-related cognitive decline → humanin is the more relevant peptide.
  • General longevity → both are part of the same story; they likely complement, not replace, each other.

For dosing, side effects, and regulatory status of MOTS-c specifically, see safety and dosing. For the underlying studies, see the research library.

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Common questions

Frequently asked questions

01What's the difference between MOTS-c and humanin?

MOTS-c and humanin are both mitochondrial-derived peptides, but they signal differently. MOTS-c primarily activates AMPK and is studied for metabolism, insulin sensitivity, and exercise. Humanin is anti-apoptotic and is mainly studied for neuroprotection (Alzheimer's models) and cardioprotection.

02Is MOTS-c or humanin better for longevity?

Both decline with age and both are part of the mitochondrial-peptide longevity story. MOTS-c has more direct metabolic-aging data (insulin sensitivity, exercise capacity in aged mice). Humanin has more neurodegeneration and cell-survival data. They likely complement rather than replace each other.

03Can you stack MOTS-c and humanin?

There is no human safety data for stacking the two. Animal work suggests they target different pathways (AMPK vs anti-apoptotic), so additive effects are plausible — but so are unknown interactions. This is research-only territory.

04Are MOTS-c and humanin both peptides?

Yes. Both are short peptides (16 and 21–24 amino acids respectively) encoded inside mitochondrial DNA rather than nuclear DNA, which is what defines them as mitochondrial-derived peptides (MDPs).

References

  1. Lee C., Zeng J., Drew B.G., et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis. Cell Metabolism, 2015. View source →
  2. 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 Aβ. PNAS, 2001. View source →
  3. Kim S.J., Mehta H.H., Wan J., et al. Naturally occurring mitochondrial-derived peptides are age-dependent regulators of apoptosis, insulin sensitivity, and inflammatory markers. Aging, 2018. View source →

Links open on PubMed or the original journal. Last reviewed dates reflect when our editorial team last verified each citation.