Tesamorelin is a synthetic growth hormone-releasing hormone (GHRH) analog studied for its interaction with GHRH receptors and its effects on growth hormone signaling, metabolic pathways, and endocrine function.
GHRH Pathway Research
Studied for its interaction with growth hormone-releasing hormone receptors and related signaling pathways.
Growth Hormone Signaling
Investigated in experimental models examining growth hormone secretion and downstream endocrine signaling.
Metabolic Research
Used in research exploring metabolic processes associated with the growth hormone axis.
Endocrine Research
Studied in laboratory models involving pituitary signaling and broader endocrine regulatory mechanisms.
What tesamorelin is
Tesamorelin is a growth-hormone-releasing hormone analogue. It acts at the GHRH receptor on pituitary somatotrophs — one step upstream of growth hormone itself, and two steps upstream of IGF-1.
That position in the axis is the point. A GHRH analogue works through a system that retains its own feedback, which makes it a different research object from administering growth hormone directly.
Why it is often studied alongside a ghrelin-receptor agonist
Tesamorelin and ipamorelin reach the same cell through two different receptors and two different second-messenger systems. That is a genuine two-input design rather than a doubled dose, which is why the pairing appears in the literature as its own subject.
If you are working with the pair, our guide on the two receptors covers why the combination is not simply additive.
Handling and reconstitution
Standard lyophilised peptide handling applies. Keep the sealed vial cold and dark until it is used. Reconstitute by running bacteriostatic water slowly down the inside wall of the vial rather than firing it onto the powder cake, and let it dissolve without shaking — swirl gently if it needs help.
The concentration you end up with is set by how much water you add, not by the vial size. Our reconstitution calculator turns vial mass and water volume into a concentration and a syringe reading.
Storage
Sealed and lyophilised: refrigerated, protected from light. In solution: refrigerated, and treat time at room temperature as a cost. Avoid repeated freeze-thaw once reconstituted.
What ships, and what is on the certificate
The vial ships sealed as it was filled. Every compound in the catalogue is tested by an outside laboratory — Vanguard Laboratory in Olympia, Washington — and the certificate is published in full rather than summarised.
The certificate reports chromatographic purity by HPLC with the chromatogram visible, the measured quantity in milligrams, and an endotoxin result by LAL. Measured quantity usually reads slightly above the label, which is normal: fills are targeted high so every vial meets its stated content.
Frequently asked questions
Where does tesamorelin act?
At the GHRH receptor on pituitary somatotrophs, one step upstream of growth hormone and two steps upstream of IGF-1.
Why is it paired with ipamorelin in some research?
They reach the same cell through different receptors and different second-messenger systems, so the pairing is studied as a two-input design rather than as a larger single input.
How should it be reconstituted?
Add bacteriostatic water slowly down the inside wall of the vial, then let it dissolve without shaking. The reconstitution calculator will convert vial mass and water volume into a concentration and a syringe reading.
Does it come with a certificate of analysis?
Yes. Every compound is tested by an independent laboratory and the full certificate, chromatogram included, is published on the site rather than summarised.
Is this a medicine?
No. It is sold for in-vitro laboratory research use only. It is not a drug, supplement or cosmetic, and is not for human or veterinary use.
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