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What Is Tesamorelin Peptide?

Tesamorelin is a synthetic peptide that functions similarly to growth hormone-releasing hormone (GHRH). It is primarily used in medical treatments for HIV-associated lipodystrophy, a disorder in which individuals with HIV exhibit abnormal distribution of body fat. Tesamorelin helps patients lose visceral adipose tissue, or the fat surrounding their organs, by boosting the pituitary gland’s production and release of growth hormone.

Studies are investigating how it affects age-related disorders, such as cognitive function and metabolic health. Endocrinology and metabolic research are interested in it because of its potential to influence body composition and improve insulin sensitivity.

Peptide Sequence (IUPAC Condensed): trans-hexenoyl-acid-Tyr-Ala-Asp-Ala-Ile-Phe-Thr-Asn- Ser-Tyr-Arg-Lys-Val-Leu-Gly-Gln-Leu-Ser-Ala-Arg-Lys-Leu-LeuGln-Asp-Ile-Met-Ser-Arg-Gln- Gln-Gly-Glu-Ser-Asn-Gln-Glu-Arg-Gly-Ala-Arg-Ala-Arg-Leu-NH2

Molecular Formula: C221H366N72O67S

Molecular Weight: 5136 g/mol

Synonyms: (3E)-Hex-3-enoylsomatoliberin

 
Tesamorelin Structure
Source: PubChem
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How Does Tesamorelin Peptide Work?

Tesamorelin functions by signaling the pituitary gland to amplify the body’s natural production of growth hormone (GH). When it binds to GHRH receptors, Tesamorelin significantly elevates GH levels, which in turn boost insulin-like growth factor-1 (IGF-1) levels. This chain reaction helps break down fat (lipolysis), specifically reducing fat around organs (visceral adipose tissue, or VAT), and improves overall body composition. This effect is especially beneficial for conditions like HIV-associated lipodystrophy.

Tesamorelin stimulates the body’s natural production of growth hormone (GH), providing a safer option compared to directly administering GH. This reduces the risk of side effects often associated with external GH use. Research also shows it may offer other benefits, like better insulin sensitivity, healthier cholesterol levels, and potential protection for brain health. These features make Tesamorelin a promising treatment option.

Buy Tesamorelin Peptide Vial from Peptide Works. This lyophilized powder is over 99% pure. It is available in 2mg and 5mg vials and also as a kit, including bacteriostatic water for reconstitution and syringes.
 

Research on Tesamorelin Peptide?

Reduction of Visceral (Abdominal) Fat: Research has shown that Tesamorelin effectively reduces visceral adipose tissue (VAT) by 15%–20% over 6–12 months in individuals with HIV-associated abdominal fat accumulation.

In clinical studies, patients achieving an ≥8% VAT reduction experienced significant metabolic benefits, including improved triglyceride levels, enhanced adiponectin levels, and better glucose homeostasis. These changes were sustained over 52 weeks, highlighting tesamorelin’s dual role in reducing harmful abdominal fat and improving endocrine and metabolic health in patients with central fat accumulation [1].

Improved Lipid Profile: Research indicates that Tesamorelin improves lipid profiles by reducing the quantity of visceral adipose tissue (VAT) and enhancing fat quality. Studies in HIV patients with central adiposity showed that tesamorelin decreased VAT volume by 15.2%, leading to reduced cardiovascular risk [2].

Additionally, it increased VAT and subcutaneous fat density (measured in Hounsfield Units), indicating smaller, healthier fat cells. This dual effect, reducing the amount of harmful fat while improving the quality of remaining fat, along with improved triglyceride levels (−50 mg/dL) and cholesterol ratios, highlights tesamorelin’s potential to support metabolic health in patients with central fat accumulation [3].

Better Glucose Metabolism:Tesamorelin demonstrates a neutral effect on glucose regulation while offering metabolic benefits [4]. In a 12-week study with type 2 diabetes patients, tesamorelin did not significantly alter insulin sensitivity, fasting glucose, HbA1c, or overall diabetes control.

However, it reduced total cholesterol and non-HDL cholesterol levels, highlighting its positive impact on lipid metabolism [5]. These findings suggest tesamorelin can improve metabolic health without compromising glycemic control, even in individuals with diabetes.

Body Composition Improvements: Research suggests that Tesamorelin improves body composition by reducing visceral adipose tissue (VAT) and enhancing muscle mass and quality. In HIV patients with abdominal obesity, tesamorelin reduced VAT by 15%–20% over 26–52 weeks while preserving subcutaneous fat [6].

It also increased skeletal muscle density and area, particularly in the rectus and psoas muscles, improving muscle quality. These changes, combined with improved body image and lipid profiles, highlight tesamorelin’s potential for enhancing metabolic and physical health [7].

Potential Benefit for Non-Alcoholic Fatty Liver Disease (NAFLD/NASH): Studies have demonstrated that Tesamorelin significantly reduces liver fat and improves markers of non-alcoholic fatty liver disease (NAFLD). In HIV patients with abdominal obesity, tesamorelin reduced hepatic fat fraction (HFF) by 37% over 12 months, with 35% achieving normal HFF levels (<5%) [8].

It also improved liver enzymes (ALT and AST) in patients with elevated baseline levels, particularly in those with significant VAT reduction. These findings highlight tesamorelin’s potential to address NAFLD in HIV patients [9].

Possible Cognitive Benefits: Tesamorelin studies have shown potential cognitive benefits by increasing IGF-1 levels, which are crucial for brain function. In HIV patients with abdominal obesity, tesamorelin reduced waist circumference and showed a trend toward improved neurocognitive performance over six months, though results were not statistically significant. IGF-1 and growth hormone pathways are linked to brain health, suggesting tesamorelin’s potential to mitigate neurocognitive impairment, though further studies are needed to confirm long-term cognitive effects.

 

References

[1] T L. Stanley, J Falutz, C Marsolais, et al (2012) Reduction in Visceral Adiposity Is Associated With an Improved Metabolic Profile in HIV-Infected Patients Receiving Tesamorelin – Clinical Infectious Diseases, Volume 54, Issue 11, 1 June 2012, Pages 1642–1651.

[2] J E Lake, K La, K M Erlandson, et al (2021) Tesamorelin Improves Fat Quality Independent of Changes in Fat Quantity – AIDS, 2021 Jul 15, Volume 35 (Issue 9), Pages 1395–1402.

[3] J Falutz, S Allas, K Blot, et al (2007) Metabolic Effects of a Growth Hormone–Releasing Factor in Patients with HIV – New England Journal of Medicine, 2007, Volume 357, Pages 2359-2370.

[4] S-H Kim and M-J Park (2017) Effects of growth hormone on glucose metabolism and insulin resistance in human – Ann Pediatr Endocrinol Metab, 2017 Sep 28, Volume 22 (Issue 3), Pages 145–152.

[5] D R Clemmons, S Miller, and J-C Mamputu (2017) Safety and metabolic effects of tesamorelin, a growth hormone-releasing factor analogue, in patients with type 2 diabetes: A randomized, placebo-controlled trial – PLoS One, 2017 Jun 15, Volume 12 (Issue 6), Page e0179538.

[6] J Falutz, J-C Mamputu, D Potvin, et al (2010) Effects of Tesamorelin (TH9507), a Growth Hormone-Releasing Factor Analog, in Human Immunodeficiency Virus-Infected Patients with Excess Abdominal Fat: A Pooled Analysis of Two Multicenter, Double-Blind Placebo-Controlled Phase 3 Trials with Safety Extension Data – The Journal of Clinical Endocrinology & Metabolism, Volume 95, Issue 9, 1 September 2010, Pages 4291–4304.

[7] S. Adrian, A. Scherzinger, A. Sanyal, et al (2019) The Growth Hormone Releasing Hormone Analogue, Tesamorelin, Decreases Muscle Fat and Increases Muscle Area in Adults with HIV – The Journal of Frailty & Aging, Volume 8, Issue 3, July 2019, Pages 154-159.

[8] T L Stanley, L T Fourman, M N Feldpausch, et al (2019) Effects of tesamorelin on non-alcoholic fatty liver disease in HIV: a randomised, double-blind, multicentre trial – The Lancet HIV, Volume 6, Issue 12, December 2019, Pages e821-e830.

[9] L T Fourman, N Czerwonka, M N Feldpausch, et al (2017) Visceral Fat Reduction with Tesamorelin Is Associated with Improved Liver Enzymes in HIV – AIDS. 2017 Oct 23, Volume 31 (Issue 16), Pages 2253–2259.

[10] M H Aguiar-Oliveira, M CS Boguszewski, D L Rovaris, et al (2025) Growth hormone and IGF-1 actions in the brain and neuropsychiatric diseases – Physiology (Bethesda), 2025 Jul 7, Volume 41 (Issue 1):0.

[11] R J Ellis, F Vaida, K Hu, et al (2025) Effects of Tesamorelin on Neurocognitive Impairment in Persons With HIV and Abdominal Obesity – J Infect Diseases, 2025 Jun 2, Volume 231 (Issue 5), Pages 1230-1238.

 

Tesamorelin Peptide FAQ's

The answers to the most frequently asked questions about Tesamorelin.

Tesamorelin FAQs

Buy Tesamorelin Peptide Nasal Spray from Peptide Works. Offered in 15ml and 30ml glass spray bottles, this nasal spray provides a convenient, needle-free alternative for effective administration.

 
Can Tesamorelin Improve Body Composition in HIV?

Tesamorelin improves body composition in HIV by reducing visceral fat and supporting lean tissue. It works by stimulating growth hormone release, which helps balance fat and muscle levels. Clinical studies show reduced deep abdominal fat and slight increases in muscle density after consistent use. When prescribed and monitored by a healthcare provider, Tesamorelin helps manage body shape changes linked to HIV treatment.

Can You Stack Tesamorelin with Other Peptides for Better Results?

Tesamorelin can be studied with other peptides such as Ipamorelin, CJC-1295, or Sermorelin to explore possible synergistic effects on growth hormone pathways. Each peptide works through different mechanisms, allowing researchers to examine combined impacts on metabolism and recovery markers. These peptide combinations are for laboratory research use only and not for human or veterinary administration.

What are the Side Effects of Tesamorelin?

Studies show Tesamorelin may cause mild side effects. Common reactions include redness, swelling, or itching at the injection site. Some research notes short-term joint or muscle pain and light fluid buildup. A few studies report small changes in blood sugar levels, though these are often not severe. Rare cases include tingling or numbness. Careful monitoring during research helps track and manage these effects.

Is it Legal to buy Tesamorelin?

In the United States, Tesamorelin is approved by the FDA only for specific medical use, but research-grade Tesamorelin can be legally purchased for laboratory studies. It is supplied to qualified research professionals and institutions, not for personal or medical use. Regulations for research peptides may vary by state, so reviewing local laws and guidelines before ordering or conducting studies is recommended.

Additional Reading
Can Tesamorelin Improve Metabolic Health?

Can Tesamorelin Improve Metabolic Health?

This article looks at Tesamorelin, a synthetic peptide that may help improve metabolic health by reducing visceral fat and balancing energy use. It explains how Tesamorelin works, compares it with AMPK activators, and explores its value in metabolic research. The peptide also offers insight into fat use, blood sugar control, and how mitochondria function.

Fat Reducing Peptide

Is Tesamorelin a Belly Fat Reducing Peptide?

This blog explains the science behind Tesamorelin, a peptide that targets belly fat through growth hormone pathways. It also compares Tesamorelin with Tesofensine, another fat-reducing peptide, showing how each affects fat use, metabolism, and body composition. The post shares research insights, benefits, and what future studies may reveal.

MOTS-C Peptide Promote Fat Loss

Can MOTS-C Peptide Promote Fat Loss?

The blog explores the potential of the MOTS-C Peptide in promoting fat loss and improving metabolic health. It highlights its role in energy regulation, fat oxidation, insulin sensitivity and mitochondrial function. By comparing MOTS-C with other peptides like AOD-9604 and Tesamorelin, the blog delves into its unique mechanisms and future research potential.

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