Tesamorelin: Frequently asked questions

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions about staying healthy and living healthier lifestyles. Everything we write is grounded in the available science on the subject. With tesamorelin and peptide therapies more broadly, we’ve spent over 200 hours digging in the literature and analyzing the findings to explore their promise as a valid treatment. As much as possible, we focused on direct clinical research on tesamorelin’s effects on visceral fat, muscle development, and cognition. When direct research was lacking, we examined the relevant biomechanisms — growth hormone, IGF-1 — to understand how increases in their production could affect human health and wellness. Our relationships with medical providers gave us a deeper understanding of the protocols and effects of tesamorelin based on their observations across years of practice, and we’ve folded that insight into this article to balance theory and real-world outcomes. One of our team members has also gained hands-on experience with tesamorelin in his ongoing peptide therapy. Additionally, like all health-related content on this website, this guide was thoroughly vetted by one or more members of our Medical Review Board for accuracy and will continue to be monitored for updates by our editorial team.

Tesamorelin is approved as a therapy for patients with HIV who’ve accumulated excess abdominal fat, but it’s also prescribed off-label to people seeking reductions in their visceral adiposity, increases in their muscle mass, and improvements in their cardiovascular or cognitive health. In some cases, treatment is indicated for individuals seeking cosmetic improvements in their skin health. More specifically, you may be a candidate for tesamorelin if you (a) don’t have a contraindicated health condition and (b) are at risk of one or more of the following:

Tesamorelin (a.k.a. tesamorelin acetate or TH9507) is a synthetic, therapeutic polypeptide analog. 1 Let’s break down what that means. Synthetic: It was created in a laboratory. Therapeutic: It’s used to treat disease. Polypeptide: It’s a long chain of amino acids 2 — 44, to be exact. Analog: It’s based on a naturally occurring peptide — in this case, growth hormone-releasing hormone (GHRH). Therapeutic peptides generally work by binding to cellular surfaces and triggering effects within the cells. According to the authors of a 2022 review on the subject, the mode of action is “similar … to biologics.” 3 In other words, they mimic the native chemicals on which they’re based. GHRH, the chemical basis for tesamorelin, does what its name says. Produced in the hypothalamus, the brain’s control center for many bodily functions, it causes the pituitary gland to release growth hormone. 4 5 Growth hormone, in turn, acts on almost every organ and tissue in two aspects: Like most therapeutic peptides, tesamorelin comes as a powder that must be reconstituted into a solution. The exact instructions for reconstitution may vary, but they generally involve combining the powder with sterile water in a syringe. Peptides are normally administered by subcutaneous injection, and so it goes with tesamorelin. It has a dosing frequency of 5-7 days per week. The monthly protocol may involve a cycle of regular dosing for 2-3 months straight, followed by a one-month break. You might sometimes find tesamorelin as an oral medication (e.g., tablets or troches), but availability seems to fluctuate. In most cases, it’s an injectable. Also, peptide therapy is usually an ongoing treatment. With tesamorelin, you see results only as long as you continue using it. 8

The tesamorelin experience can vary to certain degrees, but new patients can expect some commonalities in terms of the treatment protocol. Here, we take you through its various aspects:

Tesamorelin generally has a low safety risk partly because it’s a prescription-only treatment. Prescribing physicians use a patient’s medical history and sometimes even initial and ongoing biomarker testing to assess candidacy. The existing literature also indicates that tesamorelin is largely safe for use among people with indicated health concerns, such as excessive abdominal fat and muscle wasting. For example, in a study we referenced earlier, which entailed 52 weeks of tesamorelin administration in patients with HIV, the researchers found the peptide to be “generally well tolerated.” Importantly, tesamorelin caused no significant elevations in glucose, which would have represented a severe safety hazard given the relationship between hyperglycemia and diabetes. 9 26 That being said, there are contraindications and potential side effects:

Clinics have been prescribing peptides to private clients for years, and telehealth is only just catching up. Even among the reputable telehealth providers that are riding the peptide wave, the selection is usually limited to GLP-1 receptor agonists like Ozempic, Wegovy, and Mounjaro. Tesamorelin, however, isn’t a GLP-1 RA and currently isn’t offered by many leading telehealth platforms such as Hims, Hers, Eden, Henry Meds, or Strut. Right now, the best way to get a tesamorelin prescription is through a local medical provider. Because the telehealth space is playing catch-up, less-reputable outfits have seen an opportunity to capitalize on the growing public interest in peptide therapy. That’s why you can still find a few online purveyors that carry tesamorelin, and it’s tough to say whether or not a given one is trustworthy. Often, you’ll find that they sell research-grade tesamorelin, which is intended only for laboratory use. If you were to inject research-grade tesamorelin into your body, you run the risk of introducing contaminants that could cause serious harm. Legitimate online peptide purveyors will deal exclusively in products labeled “pharmaceutical-grade” or “GMP API,” which indicates FDA approval for human use. However, among the few online providers that offer tesamorelin, none of them appear to be well-represented on the major consumer watchdog sites. They tend to have only a handful of reviews, and that’s hardly enough to feel confident about the honesty of their labeling or the quality of their products. Again, we’re not saying one or another operation is not legit, only that we can’t confidently make an accurate assessment at this time.