Buying research peptides in the UK: a buyer's checklist

Start with the certificate of analysis

Before placing an order, a supplier should be able to show a certificate of analysis for the current batch of the specific product you are buying, not a generic specification sheet that never changes. This lets you check purity by HPLC and identity by mass spectrometry before money changes hands, rather than trusting a product description alone. Our dedicated guide on reading a certificate of analysis covers what to look for in detail.

Check the exact mass per component

Product names such as GLOW or WOLVERINE are market conventions, not standardised terms, and different suppliers can use similar names for different compositions. A trustworthy listing states the exact mass of each individual component in the formulation, for example GHK-Cu 75mg, BPC-157 15mg and TB-500 15mg, rather than only a combined total or a vague description like peptide blend.

Understand the format

Research peptides are supplied in several different formats, and each has different implications for stability, handling and equipment needed.

• Lyophilised (freeze-dried) powder in a vial, requiring reconstitution with a diluent before use
• Liquid in a vial, already in solution, requiring a syringe to draw up
• Pre-filled, pre-mixed pen, such as Celyfe's, where the cartridge is already loaded and dispensed by clicks

Check what is actually in the box

Some suppliers include diluent, syringes or needles with a vial order; others ship only the vial itself and expect the buyer to source everything else separately. A pre-filled pen format, by contrast, removes the reconstitution step entirely since the cartridge arrives already mixed. Either way, check the listing carefully so you know exactly what will and will not arrive.

Cold-chain shipping and packaging

Because in-solution peptide products are temperature-sensitive, look for cold-chain shipping: a sealed foil pouch, ice packs, and discreet, plain outer packaging that does not draw attention to the contents in transit. The absence of any temperature control for a liquid product is a sign the supplier may not be treating stability seriously.

Legal and labelling clarity

A reputable supplier should clearly label products as research use only, avoid making therapeutic or cosmetic claims about what a compound does in a human or animal body, and be transparent about their business (a real address, clear contact details, and consistent batch documentation). See our guide on the legal position of peptides in the UK for more background.

Research use only

This checklist is intended to help buyers evaluate research suppliers for laboratory and research purposes. It does not describe or endorse use of any compound in or on a human or animal body.