Compare. Track. Research Smarter.
The research hub for peptides. Compare verified vendors, find the best price per mg, and track your research in one place.
Built for research use only. Not for human consumption.
Free Forever
Download the App
Free Core. Advanced Tools for Pros.
Peptide Library is free to browse, compare, and research. Upgrade to Pro for syncing, exports, and advanced research tools.
Free Comparison Engine
Browse peptides, compare $/mg pricing, and view vendor ratings at no cost.
Free Vendor Discovery
Access verified vendors, reviews, and transparent ranking data.
Pro Sync & Cloud Backup
Sync your tracker and inventory across devices with secure cloud storage.
Pro Data Export & Advanced Tracking
Export tracker logs (CSV/PDF), access enhanced analytics, and unlock advanced research tools.
Compare Peptides
Find the best price per mg, view all vendor offers, and access exclusive coupons.
Explore Peptides→Discover Trusted Vendors
Browse verified vendors ranked by rating, reviews, and reliability.
Browse Vendors→Track Your Research
Log doses, monitor inventory, and sync your research across devices.
Open Tracker→Independent price comparison. No peptide sales. No bias.
Why Researchers Trust Peptide Library
Independent Rankings
We don't sell peptides. Vendors can't pay for placement.
Data-Driven Comparison
Compare price per mg, reviews, and availability in seconds.
Vendor Verification
Clear trust signals like COA / third-party testing and verified reviews.
How It Works
Search a peptide
Find peptides instantly with live vendor offers.
Compare vendor offers
Sort by best $/mg, rating, or popularity.
Click the best deal
Use exclusive codes and confirm pricing at checkout.
What users are saying
“Peptide Library saves me hours comparing vendors and pricing.”
Sarah M.
Austin, TX
“The $/mg comparison makes it easy to spot the best deal instantly.”
James K.
Denver, CO
“Love having favorites and vendor reviews in one place.”
Researcher
Chicago, IL
The peptide marketplace intelligence layer
Compare vendors, track research, and spot the best value fast. Peptide Library helps you research smarter with transparent rankings and platform-wide pricing visibility.
Take Peptide Library With You
Track and sync your research on mobile.