The peptides most used for weight loss are GLP-1 medications. Semaglutide activates the GLP-1 receptor, and tirzepatide activates both the GLP-1 and GIP receptors. They support appetite regulation, fullness and blood glucose control, and their branded forms are backed by large clinical trial programs. Other peptides, such as Tesamorelin, are studied for more specific goals like reducing visceral fat. All require a prescription, and the right choice depends on your history, goals and response.
Which peptides are used for weight loss?
The peptides used for weight loss fall into two groups.
GLP-1 medications. Compounded Semaglutide and Compounded Tirzepatide are the foundation of most peptide-based weight management protocols. Both are taken as a weekly injection, and both work on the hormone pathways that regulate appetite and blood glucose.
Targeted metabolic peptides. Tesamorelin supports the body's own growth hormone release and is studied for its role in reducing visceral fat, the deeper fat stored around the organs.
A clinician decides which peptide, or which combination, fits your goals and history.
How do GLP-1 peptides support weight loss?
GLP-1 peptides support weight loss by mimicking a hormone your gut releases after eating. They work through four mechanisms: they signal fullness to the brain, slow how quickly the stomach empties, support glucose-dependent insulin release and reduce glucagon after meals. Together, these support smaller portions, fewer cravings and steadier blood glucose.
For the full biology, see our guide to how GLP-1 medications work in the Journal.
Semaglutide or tirzepatide: which is right for you?
The right GLP-1 depends on your history, goals and tolerance. Semaglutide activates one receptor and has the longer clinical track record. Tirzepatide activates two receptors, and in head-to-head trials of the branded products it produced larger average weight reductions. Your clinician weighs both against your profile and recommends a starting point.
For the full comparison, see semaglutide vs. tirzepatide in the Journal.
What is Tesamorelin studied for?
Tesamorelin is a growth hormone-releasing hormone analog. It signals the pituitary gland to release more of the body's own growth hormone. A branded form is FDA-approved to reduce excess abdominal fat in a specific patient population, and Tesamorelin is studied for its role in reducing visceral fat.
That focus on visceral fat makes Tesamorelin relevant to body composition goals. Some patients use it on its own, and others combine it with a GLP-1 protocol when their clinician recommends it.
Do you need a prescription for weight loss peptides?
Yes. Semaglutide, tirzepatide and Tesamorelin are prescription medications. A board-certified, state-licensed clinician reviews your health history and goals before prescribing, sets your starting dose and adjusts it as you progress.
For a step-by-step walkthrough, see our guide to getting peptides prescribed online.
How much do weight loss peptides cost?
The cost of weight loss peptides depends on the compound, the dose and the plan length. GLP-1 doses usually increase gradually, and the price for each dose is shown on the site before checkout. Plans are available in 1-, 3- and 6-month lengths. Every plan includes clinician review, pharmacy preparation, a home injection kit and unlimited follow-up questions with the clinical team.
Weight management works best as a longer-term protocol. The most successful patients plan across several months, with clinician check-ins every three months to refine their dose and approach.
Find the weight management protocol built for you. Start Your Protocol.
IMPORTANT INFORMATION
Compounded medications are prepared by licensed pharmacies for individual patients. They are not FDA-approved and have not been evaluated by the FDA for safety, effectiveness or quality. This article is for educational purposes and is not medical advice. Speak with a licensed clinician about whether a treatment is right for you.
Clinically reviewed by
Amelia Baweja
