Meta-Analysis Confirms Peptides Extend Lifespan and Improve Healthy Aging in Worms by 46% | Research

The takeaway

A meta-analysis of nine studies found that peptide supplementation reduced mortality by 46% and improved multiple markers of healthy aging in C. elegans worms.

46% mortality reduction
Peptide supplementation reduced the risk of death in C. elegans by nearly half (HR=0.54) while also improving three key markers of healthy aging

What the researchers found

Peptide supplementation significantly extended the lifespan of C. elegans, reducing mortality risk by 46% (hazard ratio = 0.54, 95% CI: 0.47-0.62, p<0.05). Beyond living longer, peptide-treated worms also showed signs of healthier aging: pharyngeal pumping rate increased significantly (SMD = 1.64), bending frequency improved (SMD = 1.67), and lipofuscin accumulation — a marker of cellular aging — decreased dramatically (SMD = -4.48).

Subgroup analysis revealed that doses of 0.1-1 mg/mL showed the best anti-aging effects (HR = 0.50, 95% CI: 0.38-0.65), suggesting an optimal dosing range for peptide-based lifespan extension.

Why it matters

While individual studies have suggested peptides may slow aging, this meta-analysis pools data from nine studies to provide stronger statistical evidence. The finding that peptides not only extend lifespan but also improve markers of healthy aging (movement, feeding, reduced cellular damage) is particularly meaningful — living longer matters most when quality of life is preserved.

The numbers in context

2879 articles screened · 9 studies included · HR=0.54 (46% mortality reduction) · SMD=1.64 pumping rate · SMD=1.67 bending frequency · SMD=-4.48 lipofuscin · Optimal dose 0.1-1 mg/mL

How the study worked

Systematic literature search across PubMed, Scopus, and Web of Science yielded 2,879 articles. After deduplication and quality assessment using the STAIR checklist, nine studies met inclusion criteria. Data were pooled using hazard ratios for survival and standardized mean differences for health markers. Subgroup analysis examined dose-response relationships.

Who was studied

Meta-analysis of 9 studies using Caenorhabditis elegans (nematode worm model organism)

What this study cannot tell us

C. elegans is a simple nematode worm, so these results may not translate to mammals or humans. The nine included studies used different peptide types, sources, and experimental conditions. The meta-analysis combines heterogeneous peptide interventions, so the optimal specific peptides for anti-aging cannot be identified from these pooled results.

How to read the evidence

This is a meta-analysis pooling data from nine preclinical studies, providing stronger evidence than any individual study. However, all data come from C. elegans worms, not mammals or humans, limiting clinical applicability.

When this study was published

Published in 2024, this is a recent meta-analysis synthesizing the current state of evidence for peptide anti-aging effects in C. elegans.

The bigger picture

Aging research is increasingly focused on interventions that extend not just lifespan but healthspan — the period of healthy, functional living. This meta-analysis strengthens the case that peptides are among the most promising anti-aging compounds, offering benefits across multiple aging markers simultaneously. C. elegans findings have historically predicted some aging interventions that also work in mammals.

Questions still open

Which specific types of peptides (food-derived, synthetic, or endogenous) drive the strongest anti-aging effects?
Do these anti-aging benefits translate to mammalian models, and through what molecular pathways?
Is there a ceiling effect at higher peptide doses, and what explains the optimal 0.1-1 mg/mL range?

Common questions

Why use worms to study anti-aging effects of peptides?

C. elegans worms are widely used in aging research because they share many fundamental biological pathways with humans, have short lifespans (2-3 weeks) allowing rapid study of lifespan effects, and are genetically well-characterized. Many interventions that extend worm lifespan have later shown similar effects in mammals.

What types of peptides were tested in these studies?

The meta-analysis pooled results from various peptide types used across nine studies. While the specific peptides varied (including food-derived and bioactive peptides), the overall finding was that peptide supplementation as a class significantly extended lifespan and improved healthy aging markers.

Read the original research

Anti-aging effect of peptides on Caenorhabditis elegans: a meta-analysis.

Journal of the science of food and agriculture, 104(11), 6902-6913

View on PubMed ↗Publisher’s paper ↗

Citation

Huang, Chao; Zhu, Ling; Zhang, Hui; Liu, Tongtong; Wang, Li; Wu, Gangcheng. (2024). Anti-aging effect of peptides on Caenorhabditis elegans: a meta-analysis.. Journal of the science of food and agriculture, 104(11), 6902-6913. https://doi.org/10.1002/jsfa.13522