Peptides Reference Library
Metabolic: Peptides studied in relation to weight and metabolism

Tirzepatide

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A dual GLP-1/GIP receptor agonist studied for blood-sugar regulation and appetite. Status: FDA-approved (Mounjaro, Zepbound) for type 2 diabetes and obesity.

  • Tirzepatide is a 39 amino acid peptide. When we eat, natural hormones called GIP (glucagon-likepeptide-1) and GLP-1 (glucose-dependent insulinotropic polypeptide) are released by the gut. These hormones increase insulin release, suppress appetite, slow gastric emptying, and increase the feeling of fullness. Tirzepatide works like our natural hormones GIP and GLP-1 by activating the GIP and GLP-1 receptors.

    A dual GLP-1/GIP receptor agonist studied for blood-sugar regulation and appetite. Status: FDA-approved (e.g., Mounjaro, Zepbound). As with semaglutide, the shortage period that allowed broad compounding has ended.

  • Tirzepatide's dual action on GIP and GLP-1 receptors distinguishes it from other diabetes medications like GLP-1 receptor agonists (e.g., semaglutide). This dual targeting leads to enhanced insulin secretion, improved glycemic control, and a more substantial impact on weight loss compared to GLP-1 receptor agonism alone.

  • One of the standout features of tirzepatide is its impact on weight loss. In both diabetes and obesity patients, tirzepatide has been associated with significant weight reduction. In trials, participants experienced weight loss ranging from 5% to over 20% of body weight, depending on the dose and duration of treatment. This makes tirzepatide a potential game-changer in the management of obesity as well.

  • Tirzepatide enhances glucose-dependent insulin secretion and suppresses glucagon secretion by activating both the GIP and GLP-1 receptors. GIP enhances the insulinotropic effect of GLP-1, and both incretins work together to delay gastric emptying and reduce food intake. The combination leads to improved glycemic control and pronounced weight loss.

  • Preliminary data suggest that tirzepatide may also provide cardiovascular benefits. Studies indicate reductions in cardiovascular risk factors such as blood pressure and lipids, and ongoing trials are investigating its impact on major adverse cardiovascular events (MACE), though these results are not yet fully available.

  • Tirzepatide has outperformed GLP-1 receptor agonists (such as semaglutide) in head-to-head trials for both glycemic control and weight loss. It has demonstrated superior reductions in HbA1c and greater weight loss in these comparisons, positioning it as a more potent option for patients with type 2 diabetes and obesity.

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