Buying guide
How to choose and verify a research peptide
What to check before ordering: assay method, batch documentation, storage requirements and intended research use.
Growth hormone secretagogue research
Growth hormone is released in pulses from somatotroph cells in the anterior pituitary, under opposing control from GHRH, which stimulates release, and somatostatin, which suppresses it. Ghrelin receptor agonists act through a third, independent pathway. Because the two stimulatory routes converge on the same cell through different receptors, compounds from each class are commonly studied together.
Selectivity is the central variable in this category. Early secretagogues raised growth hormone but also cortisol and prolactin, confounding any downstream measurement. Selective agonists were developed specifically to isolate the growth hormone signal, and comparing selective against non-selective compounds under identical conditions is a standard experimental design.
Separately, hGH fragments isolate one region of the intact hormone. Studying the C-terminal lipolytic region alone allows adipocyte effects to be examined without the IGF-1 response that full-length growth hormone produces — a clean separation that is impossible with the intact molecule.
Practical notes for this category
Pulsatility matters in study design. Compounds with short half-lives model discrete pulses; long-acting versions produce sustained elevation, which is a physiologically different stimulus and produces different receptor desensitisation behaviour. Choose the variant that matches the question rather than the one that lasts longest.
Fusion proteins and larger constructs in this group are more fragile than the small peptides: keep them cold, avoid agitation entirely and do not vortex.
How the catalogue is organised
Compounds are grouped by the biological pathway they are used to study rather than by chemical class, because that is how research protocols are actually built. A team modelling tissue repair needs BPC-157, TB-500 and GHK-Cu in the same place; a team working on incretin signalling needs semaglutide, tirzepatide and retatrutide side by side with their purity figures visible for comparison. The category filters above reflect those working groupings.
GLP-1 and metabolic covers the incretin receptor agonists and analogues used in energy balance and insulin secretion research. Regeneration and repair holds the tissue signalling sequences. Growth factor collects the GH secretagogues and hGH fragments. Cellular and longevity covers mitochondrial, telomere and dermal matrix compounds. Neuroactive holds the CNS and cognition peptides. Gonadotropin covers the endocrine axis reference standards. Stacks are matched batch sets, and lab supplies are the consumables and diluents that every protocol needs alongside the compounds themselves.
Reading a product listing
Every listing shows four things that matter before price: the compound name, the vial size in milligrams or international units, the assayed purity percentage for the current lot, and the batch code. The purity figure is not a specification or a target — it is the result the HPLC run produced for the material you will receive, and it is reproduced on the certificate you can search in the library.
Vial size is stated as the mass of lyophilised peptide in the vial, not as a concentration, because concentration depends entirely on the volume of bacteriostatic water you choose to reconstitute with. A 5mg vial reconstituted with 2ml of diluent gives a 2.5mg/ml stock; the same vial with 5ml gives 1mg/ml. Choose the volume that puts your working concentration in a range your pipettes can measure accurately.
Batch codes follow a compound-month-run format, so BP-2408-D is the fourth production run of BPC-157 assayed in August 2024. Quoting that code in an enquiry lets us pull the exact analytical trace rather than the summary certificate.
Choosing between similar compounds
Several groups in the catalogue contain compounds that look interchangeable and are not. Among the incretins, semaglutide is a single GLP-1 receptor agonist, tirzepatide adds GIP receptor activity, and retatrutide adds glucagon receptor activity on top of both. Choosing between them is choosing how many receptor arms your model needs to isolate — running all three in parallel is the standard comparative design.
In the growth factor group, ipamorelin is a selective ghrelin receptor agonist and CJC-1295 without DAC is a GHRH analogue. They act on different receptors on the same cell population, which is why they appear together in so many protocols; AOD9604 is neither, being an hGH fragment studied for direct adipocyte effects rather than for a secretagogue response.
In the repair group, BPC-157 is associated with angiogenic signalling and TB-500 with actin-driven cell migration. The blend vial exists so that experiments needing both do not have to reconcile two separate batch histories and two reconstitution volumes.
Dispatch, packaging and what arrives
Orders placed before 3pm on a working day leave the London facility the same day on a free tracked next-day service within the UK. International orders go out within forty-eight hours on a tracked courier. Vials are sealed, cushioned and boxed with the batch documentation, and tracking is emailed as soon as the label is generated.
Every compound listed is supplied for in-vitro laboratory research by qualified personnel only. Nothing in this catalogue is a medicine and nothing is intended for human or veterinary use.