In short: Tesamorelin is a synthetic 44-amino-acid analogue of growth hormone-releasing hormone (GHRH), supplied by Vexar Lab strictly for in-vitro laboratory research and not approved for human consumption. It is widely used as a tool compound for investigating the GH/IGF-1 axis in pre-clinical models. Research buyers should confirm three things before ordering any peptide: purity of at least 99% by HPLC, identity confirmation by mass spectrometry, and clear batch numbering with a corresponding certificate of analysis (COA).
What is Tesamorelin?
Tesamorelin is a stabilised analogue of human GHRH(1-44). Its structure is identical to native GHRH with a single modification — a trans-3-hexenoic acid group attached at the N-terminus — which is reported to slow enzymatic degradation and extend its functional half-life relative to unmodified GHRH. Mechanistically, it is studied as a GHRH-receptor agonist that acts on the anterior pituitary. Rather than introducing exogenous growth hormone, pre-clinical work describes it as amplifying the pituitary’s own pulsatile GH secretion. This makes it a frequently cited reference compound in studies of neuroendocrine signalling.
What does the research investigate?
Published pre-clinical and clinical literature has examined tesamorelin’s effects on the growth hormone/IGF-1 axis, on visceral adipose tissue, and on markers of lipid and glucose metabolism. In laboratory contexts it is used to probe GHRH-receptor pharmacology, pulsatile hormone release, and metabolic regulation. Tesamorelin is notable among GHRH analogues for having a substantial body of published study data, which makes it useful as a comparator. These findings are drawn from cell, animal, and controlled clinical research and do not establish safety or efficacy for any general human use. Always read the primary sources directly.
Purity and quality: what research buyers should check
- Purity of at least 99% by HPLC — confirm the figure against the batch-specific COA rather than a generic specification sheet.
- Identity confirmation by mass spectrometry — the measured mass should match the expected molecular weight of the peptide.
- Batch numbering — every vial should trace back to a documented production batch and its analytical records.
Vexar Lab supplies Tesamorelin as a pack of 10 vials, ≥99% HPLC-verified, batch-numbered, with mass-spec confirmation.
Handling and storage
Tesamorelin is supplied lyophilised. Standard laboratory practice for lyophilised peptides applies: store the sealed vials cold and protected from light, reconstitute only with an appropriate sterile solvent immediately before use, and aliquot to avoid repeated freeze-thaw cycles. Reconstituted material is generally less stable than the lyophilised powder and should be kept refrigerated and used within a short working window. Always follow your own institution’s handling protocols.
Wholesale supply
Vexar Lab supplies Tesamorelin to research buyers and resellers in packs of 10 vials, with a £300 minimum order, bulk pricing on volume, £45 flat worldwide shipping, and optional custom labelling for resellers.
Frequently asked questions
Is Tesamorelin approved for human use?
No. Vexar Lab supplies tesamorelin strictly as a research material for in-vitro laboratory use. It is not sold for human consumption, and nothing here should be read as medical or dosing guidance.
What purity does Vexar Lab guarantee?
Each batch is verified at ≥99% by HPLC with identity confirmed by mass spectrometry, and every vial is batch-numbered against its COA.
How is it shipped and packaged?
It ships lyophilised in packs of 10 vials, with £45 flat worldwide shipping and batch documentation available on request.
This guide is provided for research-only purposes. Tesamorelin is supplied strictly for in-vitro laboratory research and is not approved for human consumption. No medical, therapeutic, or dosing advice is given or implied.
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