# Best Peptide

> A plain-English orientation to the most-studied research peptides across tissue repair, the growth-hormone axis, metabolic, longevity, immune and cognitive research — what each one is, how it works, and what the literature actually shows.

## Contents

- **[Best Peptide — Research Peptide Fundamentals research peptides, graded by evidence](/index.md)** — An independent literature desk grading Research Peptide Fundamentals research peptides — CJC-1295, ipamorelin, KPV, retatrutide, and semaglutide — by what their evidence actually supports. A digest, not a vendor or clinic.
- **[CJC-1295: Research Overview — Best Peptide](/cjc-1295.md)** — A skeptic's literature summary of CJC-1295, a long-acting GHRH analog. Covers the DAC/no-DAC mechanism, the small human pharmacokinetic evidence base, and cited safety cautions — no dosing advice.
- **[Ipamorelin: Research Overview — Best Peptide](/ipamorelin.md)** — A skeptic's literature summary of ipamorelin, a selective ghrelin-receptor growth-hormone secretagogue. Covers its founding pharmacology, its one human RCT (which missed its endpoint), and cited safety cautions.
- **[KPV: Research Overview — Best Peptide](/kpv.md)** — A skeptic's literature summary of KPV, an anti-inflammatory melanocortin-derived tripeptide. Covers the PepT1-mediated mechanism, the mouse-colitis evidence base, and the complete absence of published human trials.
- **[Retatrutide: Research Overview — Best Peptide](/retatrutide.md)** — A skeptic's literature summary of retatrutide (LY3437943), an investigational GIP/GLP-1/glucagon triple agonist. Covers the mechanism, the Phase 2 trial data, and why the evidence is still Phase 2 only.
- **[Semaglutide: Research Overview — Best Peptide](/semaglutide.md)** — A skeptic's literature summary of semaglutide, the FDA-approved GLP-1 receptor agonist. Covers mechanism, the large outcome-trial record, where it lost a head-to-head trial, and cited safety cautions.
- **[Compare CJC-1295, Ipamorelin, KPV, Retatrutide, and Semaglutide — Best Peptide](/compare.md)** — A side-by-side evidence-maturity comparison of five Research Peptide Fundamentals research peptides — mechanism, most-studied application, trial depth, regulatory status, and the single biggest caution for each.
- **[Research Peptide FAQ — CJC-1295, Ipamorelin, KPV, Retatrutide, Semaglutide — Best Peptide](/faq.md)** — Direct, evidence-graded answers to the questions readers most often bring to CJC-1295, ipamorelin, KPV, retatrutide, and semaglutide, with citations to the primary and review literature.
- **[About Best Peptide — An Evidence-Graded Scorecard](/about.md)** — About Best Peptide: an independent literature digest that grades five research peptides by the strength of their evidence rather than by how they are marketed. Not a seller, not a clinic, not medical advice.
- **[Contact Best Peptide — Editorial Desk](/contact.md)** — Reach the Best Peptide editorial desk regarding citations, corrections, or research-related correspondence about the CJC-1295, ipamorelin, KPV, retatrutide, and semaglutide literature digest.
- **[References — Research Peptide Fundamentals Literature — Best Peptide](/references.md)** — The aggregated citation list for the Best Peptide research-fundamentals digest: peer-reviewed sources on CJC-1295, ipamorelin, KPV, retatrutide, and semaglutide, with DOIs and PubMed links.