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Independent lab results · Published 30 July 2026
Two sealed samples were independently tested, and both measured above their label claim. The original report scans are below. On mobile, swipe between the two reports or open either one full size.
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A sealed 15mg vial from UK stock measured 16.49mg against its 15mg label claim.
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A sealed 50mg vial from UK stock measured 54.75mg against its 50mg label claim.
Pay by bank transfer at checkout · Royal Mail Tracked 24 £3.99 · Free UK delivery on orders of £100 or more
Lyophilised peptide powder, shipped frozen. Reconstitute with bacteriostatic water before laboratory use — see the reconstitution calculator below. Most compounds are also available as a pre-filled pen vial supplied as a complete kit (disposable pen, sterile pen tips and alcohol wipes), at least £15 over the equivalent standard vial. Choose the format on the product page.
Accessories and prep supplies: reconstitution kits, bacteriostatic water, pen tips, insulin needles and wipes. Not peptide compounds.
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Research Tools
Work out the concentration of a reconstituted research vial and the volume that corresponds to a target quantity. For laboratory planning only.
Research use only. This tool performs reconstitution mathematics for laboratory planning. It is not dosing guidance, and the figures are not instructions for use in humans or animals. See our reconstitution guide for handling notes.
Who We Are
North Peptides UK supplies lyophilised research peptides with purity stated on every product, sourced from established manufacturers and stocked in the UK.
All stock is held frozen from arrival through to dispatch. Products are not staged at room temperature before shipping.
Batch details and purity documentation are available on request. Samples of Retatrutide and GHK-Cu drawn from UK stock each returned 99% purity by HPLC, with both vials weighing in above their stated label claim. See the reports.
The ordering process is straightforward by design. Choose your product, review your basket, and complete payment by bank transfer. Pre-order questions are answered directly.
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Research-use-only supplier. You must be 18 or over to order. We will only email you about stock and research resources.
All products listed on North Peptides UK are sold strictly for laboratory and scientific research purposes only. These compounds are not medicines, are not approved for human or animal consumption, and are not intended for any medical, therapeutic, cosmetic, human, or animal use. By purchasing from North Peptides UK you confirm that you are a qualified researcher and that all compounds will be used exclusively in a controlled research environment. North Peptides UK accepts no liability for misuse.
