About Us
Beyond the standard
PepSource was founded on a simple frustration: research reagents sold with big claims and no evidence. We set out to build a supplier where every single batch is independently verified, every certificate is published, and every order ships fast from UK stock.
Today we supply laboratories, institutions and qualified researchers with research-grade peptides backed by third-party HPLC and mass spectrometry testing. No cut corners, no unverifiable claims — just documented quality, cold-chain handling and same-day dispatch.
What we stand for
- Evidence over claims — if we can't verify it, we don't sell it.
- Transparency — batch-level COAs, published openly.
- Compliance — strictly research-use-only supply, with clear labelling.
Standards without compromise
Every compound in our catalogue passes the same uncompromising pipeline before it reaches your lab.
Quality first
We only list compounds we can verify. If a batch doesn't pass independent testing, it never reaches the catalogue.
UK stock, fast dispatch
Everything ships from UK stock the same business day when ordered before 2pm — no long waits on overseas shipping.
Research-grade standards
Strict research-use-only supply, cold-chain handling, and full batch traceability from synthesis to delivery.