Humanin // Cytoprotective Peptide
A 24-amino acid mitochondrial-derived peptide with broad cytoprotective effects across neurons, cardiac tissue, and pancreatic beta cells. Originally discovered in surviving neurons of Alzheimer's disease brains. Anti-apoptotic, anti-inflammatory, and cardioprotective — the body's endogenous survival signal.
The cell's last line of defense.
Humanin was discovered in brain tissue that survived Alzheimer's neurodegeneration — neurons expressing Humanin resisted the amyloid-beta toxicity that killed neighboring cells. It turns out Humanin is a broad-spectrum cytoprotective agent, protecting cells across multiple organs from apoptosis, oxidative stress, and inflammatory damage.
Daily cytoprotective coverage.
Humanin uses continuous daily dosing for sustained cytoprotective coverage. The modified analog HNG (S14G-Humanin) has 1000x greater potency and is preferred when available.
From Alzheimer's discovery to multi-organ protection.
Humanin was discovered in 2001 by Nishimoto et al. in a cDNA library from surviving brain tissue of Alzheimer's disease patients. The peptide was encoded in mitochondrial DNA and expressed specifically in neurons that resisted amyloid-beta-induced apoptosis.
Subsequent research by Pinchas Cohen's group at USC established Humanin as part of the mitochondrial-derived peptide (MDP) family alongside MOTS-C. Studies showed Humanin levels decline with age and correlate with cardiovascular disease, cognitive decline, and metabolic dysfunction.
The S14G analog (HNG) — a single amino acid substitution — increases potency approximately 1000-fold. Preclinical studies demonstrate protection across multiple tissue types: neurons (Alzheimer's, stroke), cardiac (ischemia-reperfusion), pancreatic (beta-cell survival), and vascular (atherosclerosis).
Cytoprotective compounds compared.
| Compound | Origin | Primary Protection | Mechanism | Data |
|---|---|---|---|---|
| Humanin | mtDNA (16S rRNA) | Multi-organ | Anti-apoptotic (BAX) | Extensive preclinical |
| MOTS-C | mtDNA (12S rRNA) | Metabolic | AMPK Activation | Emerging |
| SS-31 | Synthetic | Mitochondrial | Cardiolipin Binding | Phase 3 |
| BPC-157 | Gastric juice | GI / Systemic | Growth Factors | 100+ studies |
What to watch for.
Humanin's side effect profile is manageable with proper protocol adherence. Baseline blood work before starting and periodic monitoring during use is essential.
- Very limited human safety data
- Injection site reactions (expected)
- Possible blood sugar changes (insulin-sensitizing effect)
- Theoretical tumor protection concern (anti-apoptotic in cancer cells)
- Fatigue during initiation (uncommon)
- Generally well tolerated in preclinical models
- Fasting glucose and insulin
- HbA1c
- Cardiac biomarkers (BNP, troponin)
- hsCRP / inflammatory markers
- Complete blood count
- Comprehensive metabolic panel
- Cognitive assessment (if neurological indication)
- MOTS-C — fellow MDP for comprehensive mitochondrial support
- SS-31 for mitochondrial membrane + cytoprotective coverage
- Epithalon for longevity stack — telomere + mitochondrial + cytoprotection
- Selank/Semax for cognitive — Humanin provides neuroprotection, they provide enhancement
- Caution: anti-apoptotic effects may theoretically protect tumor cells
- Not well studied in combination protocols — start conservative
- Lyophilized: store at -20°C for long-term
- Short-term: refrigerate at 2–8°C
- Reconstituted: refrigerate, use within 14 days
- Protect from light
- 24-amino acid — moderate stability
Compounds that complement Humanin.
Your mitochondria's SOS signal — now available as a protocol.
Humanin is what your mitochondria produce when cells are under existential threat — and it works. The Alzheimer's discovery story is compelling: neurons that expressed Humanin survived amyloid toxicity while neighbors died. But the applications extend far beyond neurodegeneration — cardiac protection, metabolic improvement, and broad anti-apoptotic defense across tissues. The main concern is the same anti-apoptotic mechanism that protects healthy cells could theoretically protect cancer cells too. Get comprehensive screening before starting. Stack with MOTS-C and SS-31 for the complete mitochondrial longevity protocol. Human data is limited — this is research-grade territory requiring medical guidance.
Our free Protocol Guide includes the complete Anti-Aging Stack — mitochondrial peptides, telomere protocols, cytoprotection tracking, and monitoring templates.