# The Peptide Library

> Evidence-aware peptide research and education


## Posts

- [Retatrutide: The Triple Agonist Explained](https://thepeptidelibrary.blog/retatrutide-triple-agonist/): Retatrutide explained: how this investigational triple GIP/GLP-1/glucagon agonist works, its phase 3 TRIUMPH weight-loss results, side effects and status.
- [Tirzepatide vs Semaglutide: How the Two Compare](https://thepeptidelibrary.blog/tirzepatide-vs-semaglutide/): Tirzepatide vs semaglutide compared: single vs dual receptor action, head-to-head trial results, weight loss, dosing forms, side effects and approved uses.
- [Semaglutide: What It Is and How It Works (Ozempic, Wegovy, Rybelsus)](https://thepeptidelibrary.blog/semaglutide-how-it-works/): Semaglutide explained: how this GLP-1 receptor agonist works, the difference between Ozempic, Wegovy and Rybelsus, approved uses, and safety.
- [Tirzepatide Mechanism of Action: How the Dual GIP/GLP-1 Agonist Works](https://thepeptidelibrary.blog/tirzepatide-mechanism-of-action/): Tirzepatide mechanism of action explained: how this dual GIP and GLP-1 receptor agonist controls blood sugar and appetite, why dual action matters, and its approved uses.
- [The Most Popular Peptides in 2026: A Research-Based Overview](https://thepeptidelibrary.blog/popular-peptides/): A research-based overview of the most popular peptides in 2026 — BPC-157, TB-500, Semax, Selank, MOTS-c, NAD+, tesamorelin and GHK-Cu — what each is studied for, and where the evidence stands.
- [Are Peptides Legal in the US? 2026 FDA Compounding Status Explained](https://thepeptidelibrary.blog/are-peptides-legal-us-2026/): Are peptides legal in the US? A clear 2026 explainer on FDA approval, the July 2026 compounding advisory vote, the 503A bulk list, and what it means.
- [BPC-157 vs TB-500: How the Two Recovery Peptides Compare](https://thepeptidelibrary.blog/bpc-157-vs-tb-500/): BPC-157 vs TB-500 compared: how each recovery peptide works, what the research shows, how they differ, and why they are often discussed together.
- [Semax vs Selank: How the Two Russian Nootropic Peptides Compare](https://thepeptidelibrary.blog/semax-vs-selank/): Semax vs Selank compared: how each peptide works, what the research shows, and which fits focus versus anxiety — plus safety and legal status.
- [Semax: Nootropic Peptide — Research, Benefits and Safety](https://thepeptidelibrary.blog/semax-guide/): What Semax is, how this Russian nootropic peptide works on BDNF and brain protection, what studies show, plus side effects and legal status.
- [Selank: Anti-Anxiety Peptide — Research, Benefits and Safety](https://thepeptidelibrary.blog/selank-guide/): What Selank is, how this Russian anti-anxiety peptide works on GABA and serotonin systems, what studies show, plus safety and legal status.
- [GHK-Cu for Hair Growth: Science, Benefits and How It Works](https://thepeptidelibrary.blog/ghk-cu-hair-growth/): What GHK-Cu is, how this copper peptide may support scalp and follicle health, how it compares with minoxidil and finasteride, safety and legal status.
- [Tesamorelin: GHRH Analog for Visceral Fat — Research and Safety](https://thepeptidelibrary.blog/tesamorelin-guide/): What tesamorelin is, how this FDA-approved GHRH analog works, what trials show for visceral fat and liver fat, plus safety and legal status.
- [What Is NAD+? The Cellular Energy Molecule Behind the Longevity Trend](https://thepeptidelibrary.blog/nad-plus-guide/): What NAD+ does, why levels fall with age, what NR, NMN and IV NAD+ studies show, and its safety and regulatory status.
- [MOTS-c: Mechanism, Research and Safety](https://thepeptidelibrary.blog/mots-c-guide/): MOTS-c is a mitochondrial-derived peptide studied for its role in metabolism and the body's response to exercise. Here's what the research actually shows.
- [BPC-157: Benefits, Uses and the Science Behind the Healing Peptide](https://thepeptidelibrary.blog/bpc-157-guide/): BPC-157 is a synthetic peptide studied mostly in animals for tissue repair and gut health. A look at the evidence, the human-data gap, and its legal status.
- [TB-500: Healing Research, Benefits and Safety](https://thepeptidelibrary.blog/tb-500-guide/): TB-500 is a synthetic fragment of thymosin beta-4 studied for healing and recovery. What the preclinical research shows and why human evidence is still limited.

## Pages

- [Contact](https://thepeptidelibrary.blog/contact/): We welcome questions and corrections about our educational articles.
- [Articles](https://thepeptidelibrary.blog/articles/): Browse our latest peptide research guides.
- [The Peptide Library](https://thepeptidelibrary.blog/): Clear, evidence-aware guides to peptides studied in longevity, recovery, metabolic and cognitive research.
- [About](https://thepeptidelibrary.blog/about/): The Peptide Library is an educational resource about peptides studied in laboratory and clinical research.
- [Privacy Policy](https://thepeptidelibrary.blog/privacy-policy/): Last updated: October 2026. This is a general template; review it with a professional before relying on it.


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