If you’ve been researching weight loss, you’ve probably come across peptides. Some, like semaglutide and tirzepatide, are FDA-approved medications with strong clinical evidence. Many others are discussed online with far less evidence behind them. This article explains the difference and gives an honest look at several peptides that often come up in weight-loss conversations.
Peptides are short chains of amino acids. The body makes many of them naturally, and they help regulate processes like hormone release, appetite, metabolism and cell signaling.
GLP-1 and GIP medications such as semaglutide and tirzepatide are peptide-based medications that have gone through large clinical trials and are FDA-approved for weight management in appropriate patients. They are the best-studied peptides for weight loss by a wide margin.
The compounds below are not FDA-approved for weight loss or any other use. Evidence in people is limited or mixed.
Both prompt the pituitary gland to release more of the body’s own growth hormone. Because growth hormone affects fat and muscle metabolism, they are sometimes discussed for body composition. Direct evidence that they produce meaningful weight loss in people is lacking.
Sermorelin is a lab-made form of growth hormone–releasing hormone. It was once FDA-approved to evaluate and treat growth hormone deficiency in children, but that product was discontinued. It is not approved for weight loss.
MOTS-c is a peptide made by mitochondria, the energy-producing parts of cells. Animal studies suggest it may affect insulin sensitivity and metabolism, but human research is still very early.
AOD-9604 is a fragment of the growth hormone molecule that was developed as a possible obesity treatment. In human clinical trials it did not produce meaningful weight loss compared with placebo, and it was not approved as a weight-loss drug.
Although often grouped with peptides online, 5-Amino-1MQ is actually a small molecule rather than a peptide. It blocks an enzyme (NNMT) linked to fat-cell metabolism. Research so far has been in animals and cells, not people.
Weight management works best with an individualized plan built on nutrition, physical activity, sleep, and attention to underlying medical conditions, with FDA-approved medication when appropriate. Research peptides are an interesting area of science, but claims online often go well beyond what has been shown in people.
If you’d like to talk through what the research does and doesn’t show, or learn about medical weight loss options, feel free to contact Copper Rock Clinic or call (435) 900-1210.
This article is for general educational purposes only and is not medical advice. Except for the FDA-approved medications noted above, the compounds discussed are not FDA-approved to diagnose, treat, cure or prevent any disease. Talk with a licensed healthcare professional before starting any new treatment.
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