The supplier built to the standard the supply chain wasn’t meeting. In stock, shipped from inside the EU, every batch tested.
Four compounds from the current operating catalogue, each tested at Janoshik before stock was listed. Click through to the compound monograph and the certificate format each batch follows.
A 15-amino-acid peptide derived from a partial sequence of body protection compound. Studied across 180+ PubMed-indexed publications.
A 43-amino-acid peptide naturally occurring in most cell types. Studied alongside BPC-157 in tissue-repair literature.
A copper-binding tripeptide. Glycyl-L-histidyl-L-lysine complexed with copper(II). Studied in skin and tissue-repair research.
A pentapeptide growth hormone secretagogue. Studied for selectivity within the GHRP family.
A modified GHRH analogue without DAC. Studied for short-acting growth hormone secretion patterns.
A 16-amino-acid peptide encoded by mitochondrial DNA. Studied in metabolic and ageing-related literature.
A synthetic heptapeptide derived from tuftsin. Studied in neuropeptide research literature primarily of Russian origin.
A synthetic tetrapeptide. Studied for telomerase activation and circadian regulation in ageing-related literature.
A C-terminal alpha-MSH tripeptide. Studied in inflammation-resolution and mucosal-tissue research.
Nicotinamide adenine dinucleotide, oxidised form. Studied as a substrate in sirtuin and PARP signalling research.
Bremelanotide. A cyclic heptapeptide melanocortin agonist. Studied in reproductive and central-nervous-system literature.
Each category corresponds to a documented body of preclinical and in-vitro literature. Cresten Labs supplies the compounds; the published research literature determines whether any compound is appropriate to a given experimental design.
Tissue repair pathways, angiogenic signalling, mucosal integrity, copper peptide chemistry.
Cellular renewal pathways, telomerase activation studies, mitochondrial signalling.
BDNF pathway studies, neuroplasticity, synaptic plasticity, neurotransmitter modulation.
Reproductive system signalling, endocrine pathways, fertility models.
Bacteriostatic water and sterile water for injection. Pharmacopoeial-grade reconstitution diluents.
The European peptide market has split into two shapes. Cresten sits on one side and refuses the other on purpose. Vials are what serious laboratories work with: testable, the format the published research literature was built around, the format the analytical methods are written for. Pre-filled pens optimise for consumer convenience and obscure what is actually inside. We chose vials.
Each batch comes with a printed certificate of analysis issued by Janoshik Analytical, the ISO/IEC 17025 accredited testing laboratory in Brno that runs our analytical panel. The certificate is posted to a public verification page on this site on the day stock is listed, before stock is released for shipment. The vial label, the printed certificate enclosed in the shipment, and the page on this site all reference the same batch number and the same analytical figures. You check what is in your hand against the printed certificate, both against the page on this site. Three records of the same report.
| Batch | Compound | Purity | |
|---|---|---|---|
| 2026104 |
BPC-157, 10 mg
CAS 137525-51-0
|
Specimen | View product → |
| 2026105 |
Thymosin Beta-4, 10 mg
CAS 77591-33-4
|
Specimen | View product → |
| 2026106 |
Ipamorelin, 5 mg
CAS 170851-70-4
|
Specimen | View product → |
| 2026098 |
GHK-Cu, 100 mg
CAS 130120-57-9
|
Specimen | View product → |
| 2026091 |
Epithalon, 50 mg
CAS 307297-39-8
|
Specimen | View product → |
Every compound shipped from Cresten Labs comes with its own batch-specific test report. Testing is done by accredited third-party labs; Janoshik Analytical, in Czech Republic, is one of the labs whose reports we publish. Every vial carries a QR code that links to the certificate for that specific batch. Lot numbers on the vial match the lot numbers on the certificate, which match the lot numbers in the production record.
A purity percentage on a certificate without the underlying chromatogram is essentially unverifiable. Here is how to interpret the plot, what peaks matter, and why baseline drift is more telling than the headline percentage.
Read →Most peptide suppliers test their own product. We do not. Every batch leaves Cresten Labs custody, gets tested by an unaffiliated analytical laboratory in Brno, and is published on this website before any vial ships.
Read →The European Medicines Agency guideline takes effect in June 2026. It targets pharmaceutical manufacturers, not research chemical vendors. The precise scope, the difference in jurisdiction, what European supply looks like after.
Read →Where the certificate of analysis was issued. How the batch number reconciles with the analytical report. Which laboratory ran the analytical panel. Whether the digital fingerprint matches. The 9-point checklist Cresten uses internally to evaluate every supply chain link. Useful before any peptide purchase, not Cresten-specific. Sent once.
Cresten Labs is a European research peptide supplier headquartered in the EU. Cresten Labs was started by one operator who spent years sourcing research peptides inside the European supply chain and kept running into the same thing: certificates written by the seller, batch numbers nobody could check, a different lab every time. So I built the supplier I could not find, and we run it to one rule. A batch is tested before it lists, and its certificate is published before it goes on sale. The test comes first.
Every batch is tested at Janoshik Analytical. Every certificate is published before any vial is listed for sale.
This site presents technical and editorial content on research compounds. Compounds are supplied for in-vitro and preclinical research only, not for human or veterinary use. Access is restricted to adults of confirmed age.