MOTS-c vs humanin: how the two best-studied mitochondrial peptides compare
MOTS-c and humanin are the two most-studied mitochondrial-derived peptides (MDPs). Both are encoded inside mitochondrial DNA, both decline with age, and both are sold as research chemicals. But they signal through different pathways and target different problems: MOTS-c is a metabolism peptide; humanin is a survival peptide.
Side-by-side comparison
| Attribute | MOTS-c | Humanin |
|---|---|---|
| Discovered | 2015 (Lee et al., USC) | 2001 (Hashimoto et al., Keio Univ.) |
| Length | 16 amino acids | 21–24 amino acids (humanin and analogs) |
| Encoded in | 12S rRNA region of mitochondrial DNA | 16S rRNA region of mitochondrial DNA |
| Primary mechanism | AMPK activation → glucose uptake, fatty-acid oxidation | Anti-apoptotic signaling via BAX inhibition; STAT3 activation |
| Main research focus | Metabolism, insulin sensitivity, exercise, longevity | Neuroprotection (Alzheimer's), cardioprotection, cytoprotection |
| Effect on glucose | Lowers fasting glucose, improves insulin sensitivity | Mild improvement in insulin sensitivity in some models |
| Declines with age | Yes — strongly correlated with metabolic aging | Yes — falls ~30–50% from young adulthood to old age |
| Regulatory status | Research chemical only — not FDA approved | Research chemical only — not FDA approved |
| Typical research dose | 0.1–15 mg/kg in animals; ~5–10 mg/week in protocols | Highly 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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Frequently asked questions
What'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.
Is 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.
Can 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.
Are 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
- Lee C., Zeng J., Drew B.G., et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis. Cell Metabolism, 2015. View source →
- 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 →
- 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.