What is retatrutide?

Three receptors, one molecule

A receptor is a protein on the surface of a cell that responds to a particular signal molecule. Retatrutide is described as acting on three of them: the GIP receptor, the GLP-1 receptor and the glucagon receptor. Each is named after the natural hormone that normally binds to it.

A compound that switches a receptor on is called an agonist. Because retatrutide is described as acting on all three, it is called a triple agonist.

How it compares with tirzepatide

Tirzepatide acts on two of the same receptors, GIP and GLP-1. Retatrutide adds the third, the glucagon receptor. That difference is why researchers talk about the two compounds separately. Our posts on tirzepatide and on the three receptors go into each one.

What synthetic peptide means

A peptide is a short chain of amino acids. A synthetic peptide is one built in a laboratory from individual amino acids, step by step, instead of being taken from a living source. Our post on how peptides are made describes the method in plain terms.

Strengths and kits

Retatrutide comes in several strengths. The strength is the amount of the compound in each vial, shown in milligrams, and every kit is ten vials of one strength. The product page lists the strengths that are available.

Handling in the lab

Like other freeze-dried peptides, it is supplied as a dry powder that is dissolved in a diluent before use and kept cold afterwards. Our posts on reconstitution and storage cover the routine.

Reading research papers

When you read papers on retatrutide, check which receptor each result refers to, because activity at the GIP, GLP-1 and glucagon receptors is reported separately. Also check the system the work was done in, such as cultured cells, since a result in one system does not carry over automatically to another.

Research use only

Pep Pantry products are sold for laboratory research by adults. They are not for human or veterinary use. This article describes the compound for laboratory readers only.