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Peptide Library

Official registry Search and web

Peptide research profiles, evidence by tier, comparisons and educational content. No dosing.

Source code Website Documentation

What can you do with Peptide Library?

  • Give doses, regimens, cycles, reconstitution or injection instructions.
  • List vendors, prices or purchase links.
  • Read or change any account or personal data.
  • Rank peptides or invent studies or citations.

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http peptide-library 'https://peptidelibrary.app/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "peptide-library": {
            "type": "http",
            "url": "https://peptidelibrary.app/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Peptide Library MCP Server
  2. What it does
  3. Connect
  4. Example questions
  5. Endpoint details
  6. Privacy
  7. Data
  8. REST API
  9. Links
  10. License

Peptide Library MCP Server

A remote Model Context Protocol server providing structured peptide research information, educational comparison tools, and research resources for compatible AI assistants.

Website: https://peptidelibrary.app Server URL: https://peptidelibrary.app/mcp Documentation: https://peptidelibrary.app/developers/mcp

The server is hosted by Peptide Library. It is free, anonymous and read-only: no account, no API key and nothing to install. This repository holds its public documentation, client configuration examples and registry metadata; the server itself runs from Peptide Library's private codebase.

What it does

ToolDescription
search_peptidesFuzzy search by name, synonym or alias, with research-category and research-area filters and pagination
get_peptide_detailsResearch profile: classification, mechanism and targets, evidence by tier (regulatory label, controlled human trials, other human studies, animal and in-vitro research) with cited sources, safety, FDA/WADA status, review dates
compare_peptidesSide-by-side comparison of 2 or 3 profiles on structured fields; never ranks
search_researchSearch Peptide Library's FAQ, per-peptide FAQs, articles and courses, with links
get_peptide_categoriesResearch categories with descriptions, counts and member profiles
get_research_trendsThis week's most-researched peptides in the community, as percentages
convert_unitsmg ↔ mcg, and IU only with a peptide's documented IU-per-mg factor
solution_concentrationAmount ÷ volume as mg/mL, mcg/mL (IU/mL with a documented factor)
blend_concentrationsPer-component concentration and share in one volume
cost_per_amountTotal cost and cost per mg/mcg/IU from a price you enter

Resources: peptidelibrary://categories, peptidelibrary://evidence-levels, peptidelibrary://methodology, peptidelibrary://glossary, peptidelibrary://disclaimer, peptidelibrary://peptide/{id}.

Prompts: compare_peptide_research, summarize_peptide_evidence, explain_mechanism, find_research_topics, understand_research_limitations.

Every result includes the Peptide Library URL it came from and a research-use disclaimer. Fields the library doesn't have are returned as not_documented.

What it will not do
  • Give doses, regimens, cycles, reconstitution or injection instructions.
  • List vendors, prices or purchase links.
  • Read or change any account or personal data.
  • Rank peptides or invent studies or citations.

Research and educational use only. Not medical advice. Peptide Library does not sell peptides.

Connect

Claude (claude.ai and Claude Desktop)

Customize → Connectors → Add custom connector → name Peptide Library, URL https://peptidelibrary.app/mcp. On Team and Enterprise plans an owner adds it under Organization settings → Connectors. Free plans allow one custom connector.

Claude Code
claude mcp add --transport http peptide-library https://peptidelibrary.app/mcp
ChatGPT

Where your plan or workspace allows custom MCP servers: Plugins → + → Add custom MCP server → URL https://peptidelibrary.app/mcp, Authentication No authentication → Create as a plugin. Then type @ in a chat to use it. See examples/chatgpt.md.

Cursor

~/.cursor/mcp.json (or .cursor/mcp.json in a project): examples/cursor-mcp.json

{ "mcpServers": { "peptide-library": { "url": "https://peptidelibrary.app/mcp" } } }
VS Code

.vscode/mcp.json: examples/vscode-mcp.json

Cline

Cline → MCP Servers → Configure MCP Servers, then add the entry from llms-install.md ("type": "streamableHttp", "url": "https://peptidelibrary.app/mcp"). Agents installing the server can follow that file directly.

Any MCP client

Streamable HTTP at https://peptidelibrary.app/mcp, no authentication. Generic config: examples/mcp.json.

MCP Inspector
npx -y @modelcontextprotocol/inspector --cli https://peptidelibrary.app/mcp --transport http --method tools/list

Example questions

  • What does the research say about BPC-157, and how much of it is in humans?
  • Compare semaglutide and tirzepatide: mechanism, evidence and regulatory status.
  • Which peptides in the library are studied for cognition?
  • What is the FDA and WADA status of bremelanotide (PT-141)?
  • If 10 mg is dissolved in 2 mL, what is the concentration in mcg/mL?

Endpoint details

  • Transport: Streamable HTTP (POST), stateless. Protocol revision 2026-07-28 and 2025-era clients (2024-11-05 to 2025-11-25).
  • Authentication: none; every tool is read-only (readOnlyHint: true).
  • Limits: about 300 requests per minute per IP, 64 KB per request, 25 results per page.
  • Health check: GET https://peptidelibrary.app/mcp/health.

Privacy

No account and no personal data. Peptide Library keeps daily counts of requests, tool calls, errors and the client name your assistant reports; it does not store tool arguments, results or IP addresses. The hosting provider processes IPs to apply rate limits. Full policy: https://peptidelibrary.app/privacy#mcp-server

Data

Profiles follow Peptide Library's editorial policy and methodology: claims cite PubMed, DOI, trial registries and FDA or WADA records, and evidence is labelled by kind.

REST API

The same research data (plus the vendor directory and prices, with a free key) is available as a REST API for apps and scripts: https://api.peptidelibrary.app/v1, with an OpenAPI 3.1 spec, Postman collection and TypeScript and Python SDKs. Docs: https://peptidelibrary.app/developers · Repo: https://github.com/ryandelauz/peptide-library-api

License

Documentation and examples in this repository: MIT. The hosted service and Peptide Library content are subject to the terms of service.

Frequently asked questions

What is Peptide Library?

Peptide research profiles, evidence by tier, comparisons and educational content. No dosing.

How do I install Peptide Library?

It runs as a remote server. In Claude Code: claude mcp add --transport http peptide-library 'https://peptidelibrary.app/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Peptide Library need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Peptide Library open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Peptide Library?

It is published by ryandelauz. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.