# Sermorelin vs Tesamorelin: How They Differ **By TelosRX Editorial Team** ยท 2026-08-22 **Sermorelin and tesamorelin are both growth hormone-releasing hormone analogs, but they are not interchangeable. Tesamorelin is FDA-approved for one narrow HIV-related indication, while [compounded sermorelin at Telos Rx](https://www.telosrx.com/pages/sermorelin) is not FDA-approved and is prescribed only after review by a licensed provider.** Search results file these two side by side as if they were versions of one product. They are not. ## The One Difference That Matters Most Both are analogs of growth hormone-releasing hormone (GHRH), and both prompt the pituitary to release the body's own growth hormone. That shared mechanism is real, and it is where the similarity ends. **Tesamorelin currently holds an FDA approval. Compounded sermorelin does not.** Tesamorelin is marketed as EGRIFTA for the reduction of excess abdominal fat in HIV-infected adult patients with lipodystrophy: one indication, one population. Compounded sermorelin is not FDA-approved. It is prepared by licensed US compounding pharmacies against a prescription for an individual patient. Telos Rx does not offer tesamorelin. ## Sermorelin vs Tesamorelin: Head to Head Sermorelin Tesamorelin **Drug class** GHRH analog (peptide) GHRH analog (peptide) **Molecule** First 29 amino acids of human GHRH Full 44 amino acid sequence plus a hexenoyl group on the N-terminal tyrosine **Stability** Unmodified fragment, short-lived Chemically stabilized form **US approval** Not FDA-approved as compounded; formerly approved as Geref, discontinued FDA-approved as EGRIFTA **Labeled indication** None currently Reduction of excess abdominal fat in HIV-infected adult patients with lipodystrophy **Labeled limits** No current label Not indicated for weight loss management; long-term cardiovascular safety not established **Administration** Subcutaneous, nightly before bed Subcutaneous into the abdomen, once daily **Access** Prescription only, compounded by licensed US compounding pharmacies Prescription only, branded specialty product **At Telos Rx** As low as $125 per month against a $299 comparison price, as of publication Not offered ## Structure and Stability Native human GHRH is a 44 amino acid peptide. Sermorelin is the first 29 of those, and that fragment is [described in the pharmacology literature](https://pubmed.ncbi.nlm.nih.gov/18031173/) as the shortest synthetic peptide carrying the full biological activity of GHRH. Tesamorelin takes a different route. The [FDA label](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=839334d3-8c1d-4c26-9036-2ab524a6ea75) describes the full 44 amino acid sequence of human growth hormone-releasing factor with a hexenoyl moiety, a six-carbon chain, attached to the N-terminal tyrosine. **That added group is the point of the molecule.** The native peptide degrades quickly in circulation, and the modification exists to stabilize it. Sermorelin, unmodified, is short-lived. ## How Each One Works Both bind GHRH receptors on the anterior pituitary and signal it to release growth hormone. Neither supplies growth hormone from an external source, the distinction people most often get wrong. Because the signal enters upstream, the body's own feedback loops stay in the circuit and secretion remains pulsatile. Growth hormone release is naturally largely nocturnal, which is the rationale behind bedtime dosing. IGF-1 is the biomarker used to track this axis. If the GHRH pathway is what you were reading about, sermorelin is the option Telos Rx actually offers, and the first step is a written intake reviewed by a licensed provider. [See Sermorelin at Telos Rx](https://www.telosrx.com/pages/sermorelin) ## Approval Status Is Where They Split Tesamorelin reached approval on a tightly defined claim. The EGRIFTA label carries three Limitations of Use, and two matter here: long-term cardiovascular safety has not been established, and **the product is not indicated for weight loss management.** The label also flags contraindication in active malignancy and monitoring of IGF-1 and glucose. Reading that as a general body-composition endorsement misrepresents what the agency reviewed. The molecule is covered in our [tesamorelin research guide](https://www.telosrx.com/blogs/peptides/tesamorelin-peptide-benefits-dosage-research-guide). Sermorelin has the opposite history. It was FDA-approved as Geref, first in 1990 and again in a later formulation in 1997. In December 2008 the manufacturer told the FDA it was discontinuing the product and asked for the approval to be withdrawn. The agency [later determined](https://www.federalregister.gov/documents/2013/03/04/2013-04827/determination-that-geref-sermorelin-acetate-injection-05-milligrams-basevial-and-10-milligrams) Geref was not withdrawn for reasons of safety or effectiveness, which is meaningful but does not restore approval. **Compounded sermorelin available today is not FDA-approved** and has not been through the agency's own review of safety and effectiveness. ## What Each Has Actually Been Studied For Tesamorelin has the larger modern trial base, concentrated in one population: two 26-week randomized, placebo-controlled trials. The [first of those](https://pubmed.ncbi.nlm.nih.gov/18057338/) randomized 412 patients with HIV and abdominal fat accumulation to daily subcutaneous tesamorelin or placebo, and reported a 15.2 percent decrease in visceral adipose tissue against a 5.0 percent increase on placebo, plus an 81 percent rise in IGF-1. Two details keep that honest. A [published review of the program](https://pubmed.ncbi.nlm.nih.gov/21668043/) notes the reduction held through week 52 in patients who continued, and that stopping therapy led to visceral fat reaccumulating. The effect was on visceral fat, not scale weight, which is why the label calls it weight neutral. Sermorelin's file looks different. Its documented clinical role was as a provocative test of pituitary growth hormone secretion and, in the Geref era, in children with idiopathic growth hormone deficiency. There is no equivalent large randomized program in healthy adults. Our [sermorelin research guide](https://www.telosrx.com/blogs/hormone-longevity/sermorelin-growth-hormone-peptide-research-guide) covers that record, and [what to realistically expect](https://www.telosrx.com/blogs/peptides/sermorelin-before-and-after-expectations) sets boundaries around it. Dosing figures on both sides describe trial and label conditions. They are not instructions, and the prescribing provider decides what is appropriate. ## Administration in Practice Tesamorelin is supplied as a lyophilized powder, reconstituted and given as a small once-daily subcutaneous injection into the abdomen. Current labels specify 1.4 mg daily for EGRIFTA SV and 1.28 mg daily for EGRIFTA WR. Compounded sermorelin at Telos Rx is a small nightly subcutaneous injection, typically before bed. The formulation can vary by state, and the prescribing provider sets the regimen. For the other GHRH pairing, see [CJC-1295 vs sermorelin](https://www.telosrx.com/blogs/peptides/cjc-1295-vs-sermorelin-comparison). ## Cost Considerations A like-for-like price comparison is not really available. Tesamorelin is a branded FDA-approved specialty product, generally dispensed through specialty pharmacy channels and billed to insurance for patients who meet the approved indication. Compounded sermorelin is cash-pay. At Telos Rx it is listed as low as $125 per month against a $299 comparison price as of publication, with the rate depending on plan length. Free 48-hour shipping is included if approved, FSA and HSA are accepted, and you can cancel anytime. ## Neither One Is HGH This causes the most confusion, and it has a legal dimension. Human growth hormone means somatropin, a recombinant hormone given from outside the body and FDA-approved only for specific indications such as diagnosed growth hormone deficiency. Federal law at 21 U.S.C. 333(e) makes it an offense to knowingly distribute human growth hormone for any use in humans other than treating a disease or other recognized medical condition authorized by the Secretary of Health and Human Services, pursuant to the order of a physician. It defines the term as somatrem, somatropin, or an analogue of either, which is why distribution for anti-aging or athletic purposes is not lawful. **Sermorelin and tesamorelin are analogs of GHRH, a different molecule, and neither is synthetic growth hormone.** Both remain prescription drugs. More in [sermorelin vs HGH](https://www.telosrx.com/blogs/hormone-longevity/sermorelin-vs-hgh). ## How a Telos Rx Evaluation Works Telos Rx is an online-first, asynchronous telehealth service. You complete a written intake covering health history and current medications, and a licensed provider reviews it in writing without a scheduled appointment. Everything is subject to medical approval by a licensed provider, and approval is not guaranteed. Service is available in all 50 states through a network of licensed US compounding pharmacies. Before comparing vendors, read [where to buy sermorelin safely](https://www.telosrx.com/blogs/peptides/where-to-buy-sermorelin-safely): a prescription is required, and research-chemical sellers are not a lawful or safe alternative. ## Keep Reading - [Sermorelin research guide](https://www.telosrx.com/blogs/hormone-longevity/sermorelin-growth-hormone-peptide-research-guide) - [Sermorelin vs HGH](https://www.telosrx.com/blogs/hormone-longevity/sermorelin-vs-hgh) - [Sermorelin before and after](https://www.telosrx.com/blogs/peptides/sermorelin-before-and-after-expectations) - [Where to buy sermorelin safely](https://www.telosrx.com/blogs/peptides/where-to-buy-sermorelin-safely) - [Is peptide therapy safe?](https://www.telosrx.com/blogs/peptides/is-peptide-therapy-safe-questions-answered) - [How to start peptide therapy](https://www.telosrx.com/blogs/peptides/how-to-start-peptide-therapy-guide) ## Frequently Asked Questions ### Is tesamorelin better than sermorelin? Better depends on the question being asked. Tesamorelin has a current FDA approval and a larger modern trial base, but that approval covers one indication in adults with HIV-associated lipodystrophy. Compounded sermorelin is not FDA-approved. Neither is a general-purpose body-composition drug, and only a licensed provider can judge suitability. ### Is tesamorelin FDA-approved? Yes, under the EGRIFTA brand, for the reduction of excess abdominal fat in HIV-infected adult patients with lipodystrophy. That is the entire approved indication. The label also states the product is not indicated for weight loss management and that long-term cardiovascular safety has not been established. Use outside that indication is not an FDA-approved use. ### Is sermorelin FDA-approved? Not in its compounded form. Sermorelin was previously FDA-approved as Geref, but the manufacturer discontinued it in 2008 and asked for the approval to be withdrawn, and the agency later determined the withdrawal was not for reasons of safety or effectiveness. Compounded sermorelin today is made by licensed US compounding pharmacies and is not FDA-approved. ### Can you buy tesamorelin online? Tesamorelin is a prescription medication, so it cannot lawfully be bought without a prescription from a licensed provider. The FDA-approved product is dispensed through pharmacy channels for patients who meet the labeled indication. Telos Rx does not offer tesamorelin. Peptides sold as research chemicals sit outside the pharmacy system and are not a safe substitute. ### Do sermorelin and tesamorelin work the same way? The pathway is the same. Both are GHRH analogs that bind receptors on the anterior pituitary and prompt it to release the body's own growth hormone, so secretion stays pulsatile. The molecules differ in length and stability, and they differ far more in approval status and in what each has been studied for. ### Is sermorelin or tesamorelin the same as HGH? No. Human growth hormone means somatropin, a recombinant hormone given from outside the body and approved only for specific medical indications. Sermorelin and tesamorelin are analogs of growth hormone-releasing hormone, which acts one step earlier by signaling the pituitary. Neither is synthetic growth hormone, and neither should be described that way. _TelosRX is LegitScript-certified. Compounded medications are not FDA-approved and are prepared under federal compounding regulations. Approval is subject to evaluation by a licensed provider; approval is not guaranteed. Individual results vary. TelosRX operates as an online-first, asynchronous telehealth service._ If sermorelin is the GHRH option you want a provider to weigh, start with the [sermorelin product page](https://www.telosrx.com/pages/sermorelin), then complete the written intake for your evaluation: [start an online visit for sermorelin](https://start.telosrx.com/start-online-visit/sermorelin). A licensed provider reviews every request, and approval is not guaranteed. **Tags:** ghrh analog, growth hormone peptides, peptide comparison, peptides, sermorelin, telehealth, tesamorelin --- > Source: [Telos RX](https://www.telosrx.com/blogs/peptides/sermorelin-vs-tesamorelin-comparison)