12 Hallmarks of Aging. The peptides being studied to address each one. Your complete research reference.
In 2013, researchers published the landmark paper "The Hallmarks of Aging" (López-Otín et al., Cell), identifying 12 interconnected biological processes that drive aging at the cellular level. Since then, peptide research has emerged as a powerful lens for studying interventions that target these hallmarks individually and synergistically. This cheat sheet maps each hallmark to the peptides being explored in laboratory research.
Accumulation of DNA damage over time from endogenous and exogenous sources — oxidative stress, replication errors, radiation, and environmental toxins. The integrity of nuclear and mitochondrial DNA degrades progressively.
GHK-Cu (CAS 89030-95-5) has been studied for its influence on DNA repair gene expression, affecting over 4,000 genes in laboratory models. Epithalon has been explored for telomerase reactivation, which may indirectly support genomic maintenance.
Telomeres — protective caps at chromosome ends — shorten with each cell division. When critically short, cells enter senescence or apoptosis, limiting tissue regeneration capacity.
Epithalon (Ala-Glu-Asp-Gly) has been studied for its potential to reactivate telomerase reverse transcriptase (hTERT), the enzyme responsible for rebuilding telomere sequences. Research has explored its influence on pineal gland function and melatonin regulation.
Changes in DNA methylation patterns, histone modifications, and chromatin remodeling that accumulate with age, altering gene expression without changing the DNA sequence itself.
GHK-Cu has been studied for its ability to reset gene expression patterns, potentially influencing epigenetic marks. NAD+ serves as a critical substrate for sirtuins (SIRT1-7), which are histone deacetylases that regulate epigenetic state.
Decline in the cell's ability to properly fold, maintain, and degrade proteins. Leads to accumulation of misfolded or aggregated proteins — a hallmark shared with neurodegenerative conditions.
BPC-157 has been studied for its cytoprotective properties and influence on the nitric oxide signaling pathway. Thymosin Alpha-1 has been explored for its role in cellular stress response and proteostatic maintenance through immune modulation.
Autophagy — the cell's recycling system — declines with age. Damaged organelles and proteins accumulate instead of being cleared, contributing to cellular dysfunction.
MOTS-c activates AMPK, a master metabolic sensor that promotes autophagy. NAD+ supports sirtuin-mediated autophagy pathways including SIRT1 deacetylation of autophagy-related proteins.
Cells permanently stop dividing but resist apoptosis, accumulating in tissues. Senescent cells secrete inflammatory factors (SASP) that damage neighboring cells and promote chronic inflammation.
Epithalon has been studied for delaying cellular senescence through telomere maintenance. GHK-Cu influences gene expression patterns associated with cellular aging. KPV (CAS 67727-97-3) inhibits NF-κB inflammatory signaling, targeting the SASP phenotype.
Mitochondria lose efficiency with age — reduced ATP production, increased reactive oxygen species (ROS), and impaired quality control through mitophagy.
MOTS-c is the first mitochondrial-derived peptide shown to regulate metabolic homeostasis via AMPK activation. NAD+ is essential for electron transport chain function and mitochondrial biogenesis through SIRT1/PGC-1α pathways.
The mTOR, AMPK, insulin/IGF-1, and sirtuin pathways lose precise calibration with age, disrupting the cell's ability to respond appropriately to nutritional signals.
MOTS-c directly activates AMPK, a central nutrient sensor. Tirzepatide (dual GIP/GLP-1 agonist) and Retatrutide (triple GIP/GLP-1/Glucagon agonist) have been studied for their influence on glucose homeostasis and metabolic signaling cascades.
The regenerative capacity of tissues declines as stem cell pools are depleted or become dysfunctional, reducing the body's ability to repair and regenerate tissues.
BPC-157 and TB-500 have been studied for their roles in tissue regeneration, angiogenesis, and cell migration through PI3K/Akt signaling. GHK-Cu has been explored for its influence on stem cell recruitment and tissue remodeling gene expression.
Age-related changes in endocrine, neuroendocrine, and neuronal signaling disrupt coordinated tissue function. Includes chronic low-grade inflammation ("inflammaging").
KPV inhibits NF-κB, a master regulator of inflammatory signaling. Thymosin Alpha-1 modulates immune cell communication through TLR activation. Selank influences GABA and cytokine signaling, bridging neuro-immune communication.
"Inflammaging" — persistent, low-grade, sterile inflammation driven by senescent cell accumulation, gut barrier dysfunction, and immune dysregulation. A root driver connecting multiple hallmarks.
KPV is one of the most potent anti-inflammatory peptide fragments studied, acting via MC1R to inhibit NF-κB. BPC-157 has been explored for gastrointestinal protection and nitric oxide pathway modulation. Thymosin Alpha-1 regulates adaptive immune balance through cytokine modulation.
Age-related shifts in gut microbiome composition — reduced diversity, increased pathogenic species, and compromised intestinal barrier function contributing to systemic inflammation.
BPC-157 was originally derived from a gastric protein and has been extensively studied for gastrointestinal protection and mucosal healing. KPV has been explored for its anti-inflammatory effects in gut epithelial models and potential influence on intestinal barrier integrity.
| Peptide | Primary Target | Key Pathway | Hallmarks Addressed |
|---|---|---|---|
| GHK-Cu 89030-95-5 | DNA Repair / Collagen | Copper-dependent enzymes | 1, 3, 6, 9 |
| Epithalon | Telomerase | hTERT activation | 1, 2, 6 |
| MOTS-c | Metabolic Homeostasis | AMPK activation | 5, 7, 8 |
| NAD+ | Cellular Energy | Sirtuins / ETC | 3, 5, 7 |
| BPC-157 | Tissue Repair | NO / PI3K/Akt | 4, 9, 11, 12 |
| TB-500 | Cell Migration | Actin / PI3K/Akt | 9 |
| KPV 67727-97-3 | Anti-Inflammation | MC1R / NF-κB | 6, 10, 11, 12 |
| Thymosin α-1 62304-98-7 | Immune Modulation | TLR2/9 activation | 4, 10, 11 |
| Sermorelin 86168-78-7 | GH Secretion | GHRH-R / cAMP | Hormonal decline |
| Tirzepatide | Metabolic Signaling | GIP-R / GLP-1R | 8 |
| Retatrutide | Triple Receptor | GIP/GLP-1/GCGR | 8 |
| Selank | Neuro-Immune | GABA / IL-6 | 10 |