Tesamorelin vs. Sermorelin: What's the Difference? Both tesamorelin and sermorelin are peptides that work through growth hormone (GH) pathwaysbut they're used for very different goals Tesamorelin What it is: A Which Is Better For Fat Loss, Tesamorelin Or Sermorelin? Does Fat Come Back After Stopping Tesamorelin? This patient started on Tesamorelin peptide and the difference speaks for itself less midsection fat, more visible tone, and improved muscle definition in just one month. Peptides like Tesamorelin work by