This guide covers what UK-based researchers need to know before sourcing research peptides: the legal framework, how to evaluate a supplier, what proper documentation looks like, and where to find detailed information on specific compounds.
The Legal Position, Briefly
Most research peptides — including BPC-157, TB-500, GHK-Cu, Ipamorelin, CJC-1295, and Epithalon — are not controlled substances under the UK Misuse of Drugs Act 1971, and can be lawfully supplied for laboratory research purposes. None of these compounds are licensed medicines, and supplying or marketing them for human or veterinary use is prohibited under the Human Medicines Regulations 2012. For a fuller breakdown, see our FAQ.
What Separates a Credible Supplier From an Unreliable One
The research peptide market has grown quickly, and documentation standards vary enormously between suppliers. A few markers are worth checking before ordering from anyone:
Batch-specific COAs, not generic templates. A credible Certificate of Analysis corresponds to one manufacturing batch, identified by a lot number that matches the physical vial — not a document recycled across every shipment a supplier sends out. See our guide to reading a peptide COA for a full breakdown of what to check.
Independent testing, not just supplier-provided documentation. Many suppliers rely solely on the manufacturer’s own internal paperwork. A more rigorous standard is independent third-party laboratory verification before a batch is ever listed for sale.
Clear, compliant language. A supplier using words like “dosage,” “injection protocol,” or making implied health claims is making what amounts to a medicinal claim — which is not permitted for an unlicensed research compound, and is a signal the supplier may not be operating to a compliant standard.
UK-based company registration. A registered UK company gives you a verifiable legal entity to deal with, rather than an anonymous storefront with no accountability.
Understanding Purity and Identity
Two separate tests matter most when evaluating a peptide’s quality:
HPLC purity measures what proportion of the sample is the correct target compound versus synthesis byproducts or degradation products. ≥98% is the widely accepted research-grade standard.
Mass spectrometry confirms the compound’s identity by measuring its molecular weight against the expected value. Purity and identity are two separate questions — a high purity figure alone does not confirm you’ve received the correct compound.
Storage and Handling
Research peptides ship and are stored most effectively as lyophilised (freeze-dried) powder, which is far more stable than any reconstituted solution. See our full Shipping & Storage Guide for detailed handling guidance.
Compound-Specific Research Overviews
For detailed mechanistic information on individual compounds, see our dedicated research articles:
- BPC-157 Research Overview
- TB-500 Research Overview
- BPC-157 vs TB-500 Comparison
- GHK-Cu Research Overview
- Ipamorelin and CJC-1295 Research Overview
- Epithalon Research Overview
- NAD+ Research Overview
Claripep’s Approach
Every compound we list is independently tested by a third-party laboratory before being made available, with the batch-specific COA published alongside the product. Browse our catalogue to see current and upcoming compounds.
This guide is provided for general informational and educational purposes and does not constitute legal advice. All products supplied by Claripep Ltd are intended strictly for laboratory research applications.