What Is Tesamorelin?
Tesamorelin is a synthetic analogue of growth hormone-releasing hormone (GHRH), the endogenous hypothalamic peptide that stimulates pituitary growth hormone secretion. It consists of the full 44-amino acid sequence of human GHRH with a trans-3-hexenoic acid modification at the N-terminus, which enhances its stability and extends its biological half-life compared to native GHRH. Tesamorelin was developed by Theratechnologies and has been the subject of substantial peer-reviewed research, particularly in the context of visceral adiposity and metabolic dysfunction.
Mechanism of Action
Tesamorelin acts by binding to GHRH receptors on pituitary somatotroph cells, stimulating the pulsatile secretion of growth hormone (GH). This downstream GH release subsequently elevates insulin-like growth factor 1 (IGF-1) concentrations, a key mediator of many growth hormone effects. Unlike exogenous GH administration, tesamorelin preserves the physiological pulsatility of GH release through its action at the hypothalamic-pituitary axis. Research suggests this mechanism underlies its observed effects on visceral fat reduction and lipid metabolism in study populations.
Research Context
Tesamorelin received FDA approval in 2010 under the brand name Egrifta for the reduction of excess abdominal fat in HIV-infected patients with lipodystrophy, making it one of the few GHRH analogues with regulatory approval. Published Phase 3 clinical trial data demonstrated significant reductions in visceral adipose tissue measured by CT imaging, alongside improvements in lipid profiles and body composition. These findings have prompted broader research interest in GHRH agonism as a strategy for metabolic and body composition modulation beyond the HIV lipodystrophy context.
Research Areas
Key research areas for tesamorelin include GHRH receptor pharmacology, visceral adiposity and metabolic syndrome, lipid dysregulation, IGF-1 biology, HIV-associated lipodystrophy, cognitive function in older adults, and growth hormone deficiency states. More recent research has explored tesamorelin’s potential effects on cognitive function, with published data from randomised controlled trials examining its impact on executive function and memory in older research populations.
Research Considerations
Tesamorelin is supplied in lyophilised form and requires reconstitution with sterile water or bacteriostatic water prior to use in research protocols. Storage at -20°C is recommended for long-term stability, with protection from light. Researchers should account for the downstream effects of GH and IGF-1 elevation when designing experimental protocols, as these can confound results in models not specifically studying the GH axis. The N-terminal modification distinguishes tesamorelin from native GHRH and should be noted when comparing with other GHRH analogues in the literature.
Where to Source Tesamorelin in Europe
Peptifly supplies Tesamorelin in lyophilised vials, independently tested for 99%+ purity by a third-party laboratory. We dispatch from EU-based fulfilment centres with temperature-controlled packaging to ensure compound integrity in transit. Browse our full catalogue at peptifly.com/shop.
Frequently Asked Questions
How does tesamorelin differ from sermorelin or CJC-1295?
All three are GHRH analogues, but they differ in sequence length, modifications, and half-life. Tesamorelin is the full 44-amino acid GHRH sequence with an N-terminal trans-3-hexenoic acid group. Sermorelin is a shorter 29-amino acid fragment, while CJC-1295 incorporates a drug affinity complex (DAC) for extended half-life. Tesamorelin is unique in having FDA approval for a specific metabolic indication.
Is tesamorelin approved for clinical use?
Tesamorelin is FDA-approved as Egrifta for HIV-associated lipodystrophy. Outside of this approved indication, it is studied for research purposes only. Peptifly supplies tesamorelin strictly for research and laboratory use.
Where can I buy tesamorelin in Europe?
Peptifly supplies tesamorelin vials with EU dispatch and independent purity verification for research use. Order at peptifly.com/shop.
Disclaimer: All peptides sold by Peptifly are strictly for research and laboratory use only. This article is for informational purposes only.