What is RETATRUTIDE + CAGRILINTIDE?
Retatrutide + Cagrilintide is a two-component synthetic peptide combination intended strictly for in-vitro laboratory research. Retatrutide (CAS 2381089-83-2) is classified as a unimolecular triple-receptor agonist peptide engineered to interact with the GIP, GLP-1, and glucagon receptor families. It is a 39-residue chain carrying a C20 fatty-diacid conjugation (per COA), with an approximate molecular weight of 4731.3 Da. Cagrilintide (CAS 1415456-99-3) is classified as a long-acting amylin analogue peptide; it is a 32-residue chain with the molecular formula C194H308N56O59 and an approximate molecular weight of 4006.4 Da.
Structurally, both peptides belong to the family of lipidated, acylated analogues in which a fatty-acid moiety is incorporated into the sequence, a design feature associated with long-acting peptide constructs. Retatrutide's sequence is a hybrid backbone drawing on incretin and glucagon peptide motifs, while Cagrilintide is derived from the amylin peptide scaffold. Each is manufactured by solid-phase peptide synthesis and purified to a research-grade specification of ≥99% by HPLC, with a Certificate of Analysis available for lot-level verification.
Within the scientific literature, incretin/glucagon multi-receptor agonists and amylin analogues are studied together as reference tools in in-vitro metabolic-signaling and receptor-pharmacology research. This combination is offered solely as a neutral research material for such investigational contexts. No physiological, therapeutic, or performance outcome is claimed or implied, and the material is not intended for human or veterinary use, diagnosis, or treatment.
Reconstitution & handling
Both peptides are supplied lyophilized and are typically reconstituted with a compatible aqueous solvent such as bacteriostatic or sterile water; the solvent volume is selected by the researcher to achieve the concentration required by the experimental protocol. To dissolve the powder, solvent should be directed gently against the interior wall of the vial rather than sprayed directly onto the peptide cake, and the vial swirled slowly rather than shaken, since acylated peptides of this class can be sensitive to mechanical agitation and foaming. Allow the material to hydrate and clarify undisturbed; a clear, particulate-free solution is the visual indicator of complete dissolution.
As lipidated peptides, Retatrutide and Cagrilintide may dissolve more readily in a mildly alkaline aqueous medium than in plain neutral water, and researchers working with these constructs sometimes use a small proportion of a compatible cosolvent to aid initial solubilization before dilution into the working buffer. Reconstitution should be performed under clean conditions to preserve analytical integrity, and prepared solutions should be handled to minimize repeated exposure to air and warming.
Storage & stability
In lyophilized form both peptides are most stable when kept sealed, desiccated, and protected from light at freezer temperatures for long-term storage, with brief periods at refrigerated or ambient temperature tolerated during shipping and handling. Once reconstituted, the solution should be kept refrigerated and used within a short working window; for extended storage of aqueous material, aliquoting and freezing is preferred to avoid repeated freeze-thaw cycles, which can degrade acylated peptide structures. Minimizing exposure to heat, light, and oxygen preserves the ≥99% purity profile documented on the Certificate of Analysis.
How it's tested
Identity and purity of each component are verified analytically prior to release. Reversed-phase high-performance liquid chromatography (HPLC) is used to quantify chromatographic purity against the ≥99% specification and to resolve related peptide impurities. Mass spectrometry (MS) confirms molecular identity by matching the observed mass to the expected values for Retatrutide (~4731.3 Da) and Cagrilintide (~4006.4 Da). These results, together with lot-specific data, are documented on a Certificate of Analysis (COA) that accompanies the material and is available for third-party verification.