Tesamorelin is a synthetic analogue of growth-hormone-releasing hormone (GHRH). It is studied in research for how it stimulates the body’s own pulsatile growth-hormone release. The molecule is the basis of an FDA-approved medication, but material sold for laboratory work is research-use-only.
- Class: stabilized GHRH analogue (growth-hormone secretagogue).
- Mechanism: agonist at the GHRH receptor on the pituitary.
- Notable design: an N-terminal cap improves stability against DPP-4 breakdown.
- Status: the molecule underlies an approved drug; research-grade material is for laboratory use only.
What is Tesamorelin?
Tesamorelin is an analogue of GHRH, the hormone that signals the pituitary gland to release growth hormone. A structural modification at the N-terminus (a trans-3-hexenoyl group) makes it more resistant to enzymatic breakdown than natural GHRH, giving it a longer research half-life.
| Class | GHRH analogue (growth-hormone secretagogue) |
| Target | GHRH receptor (anterior pituitary) |
| Design feature | N-terminal cap for DPP-4 resistance |
| Lab form | Lyophilized (freeze-dried) powder |
| Status | Research-grade material is research use only |
How it works in research
Tesamorelin binds the GHRH receptor on pituitary somatotroph cells, activating the cAMP/PKA pathway that drives growth-hormone synthesis and release. A defining research characteristic is that it works upstream: rather than adding growth hormone directly, it prompts the pituitary to release it in the body’s natural pulsatile pattern.
- GHRH-receptor agonism — stimulates the pituitary directly.
- Pulsatile release — preserves the natural burst pattern in models, unlike direct GH administration.
- Improved stability — the N-terminal modification resists DPP-4 cleavage.
Related compounds
Tesamorelin sits in the same broad research category as other growth-hormone secretagogues, such as the CJC-1295 / Ipamorelin blend — though those combine a GHRH analogue with a separate ghrelin-receptor peptide. See our overview of how the CJC-1295 & Ipamorelin blend is studied.
Storage & handling
Tesamorelin is supplied lyophilized. Store cold and away from light, reconstitute only when needed for research, and minimize freeze–thaw cycles. See our guide on reconstituting lyophilized peptides.
Research status
The tesamorelin molecule is the active ingredient in an FDA-approved prescription medication for a specific medical condition. Material sold here is research-grade and intended only for laboratory research — not for human use.
Looking for research-grade Tesamorelin?
Lab-tested, with third-party purity verification.