Just some of some frequently asked questions
We are also available 24/7 to answer some of your worries and clerify you where neccessary
How should peptides be stored?
Proper handling and storage are important for keeping peptides in good condition. Here is what we recommend:
Temperature: Store freeze-dried peptides at 2-8°C (fridge) for short-term use or -20°C (freezer) for long-term storage.
Light: Keep away from direct light. UV can degrade certain residues, particularly tryptophan and tyrosine.
Moisture: Keep vials sealed until ready for use. Freeze-dried peptides absorb moisture from the air, which speeds up degradation.
Handling: Let refrigerated or frozen vials reach room temperature before opening, to prevent condensation forming inside the vial.
After reconstitution: Aliquot into single-use volumes if possible and store frozen. Avoid repeated freeze-thaw cycles.
Handle peptides using standard laboratory practices for research chemicals. MSDS sheets are available on request for any product in our catalogue.
Do you supply blended peptides (e.g., CJC-1295 + Ipamorelin)?
No, we do not supply pre-blended peptide combinations. All peptides are sold as individual, single-compound products.
This is a quality control decision. Blending two or more peptides in one vial makes it harder to verify the purity, identity and quantity of each component. By supplying individual compounds, every product can be independently verified against its Certificate of Analysis.
If you need multiple peptides for a study, order each one separately and manage reconstitution and combination according to your own protocols.
Do you offer discount codes or promotions?
We use a fixed-pricing model. Prices reflect the cost of high-purity, tested research peptides and are the same for every customer. We may run occasional promotions which will be shown on the website when active.
We do not distribute discount codes through third-party websites, affiliates or external channels. Any codes you find outside of uk-peptides.com are likely fake.
Do you provide a Certificate of Analysis (CoA)?
In-house CoAs are available for download on each product page. These are not batch-specific. They confirm the identity and minimum purity of each product based on our internal HPLC and MS testing. CoAs are not included with orders. To download one, visit the product page and select the relevant item from the dropdown. We encourage researchers to arrange their own independent testing if batch-level verification is required for their work.
A typical in-house CoA includes:
Peptide identity: Sequence, molecular formula and molecular weight.
Purity: Determined by HPLC analysis, expressed as a percentage (typically ≥98% for most products).
Mass spectrometry: Confirmation of molecular identity via MS or LC-MS.
Appearance: Physical description of the lyophilised product.
Batch/lot number: For reference.
If a CoA is not visible on the product page, let us know and we will sort it out.