Peptide Library

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

Tool	Description
search_peptides	Fuzzy search by name, synonym or alias, with research-category and research-area filters and pagination
get_peptide_details	Research 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_peptides	Side-by-side comparison of 2 or 3 profiles on structured fields; never ranks
search_research	Search Peptide Library's FAQ, per-peptide FAQs, articles and courses, with links
get_peptide_categories	Research categories with descriptions, counts and member profiles
get_research_trends	This week's most-researched peptides in the community, as percentages
convert_units	mg ↔ mcg, and IU only with a peptide's documented IU-per-mg factor
solution_concentration	Amount ÷ volume as mg/mL, mcg/mL (IU/mL with a documented factor)
blend_concentrations	Per-component concentration and share in one volume
cost_per_amount	Total 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

Links

• Website: https://peptidelibrary.app
• Developer API: https://peptidelibrary.app/developers
• iOS app: https://apps.apple.com/us/app/peptide-library-peptide-log/id6755092737
• Android app: https://play.google.com/store/apps/details?id=com.peptidelibrary.app
• Support: https://peptidelibrary.app/support · [email protected]
• Security: SECURITY.md

License

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