How Long Does Cagrilintide Last? Shelf Life & Stability
"Stable" is meaningless without saying stable against what. Cagrilintide has its own set of degradation routes, and they determine which storage precautions actually matter for it.
Overview
This is the compound where clumping matters most. Natural amylin turns into fibres almost eagerly; the whole point of cagrilintide’s design is to resist that. Shaking, frothing and freezing all push it back toward that pathway, and once fibres start forming they do not dissolve again when things warm up. Visible specks or a settling haze mean the vial is finished.
What Cagrilintide actually is
Cagrilintide is an engineered copy of amylin — a hormone released from the pancreas at the same time as insulin. The natural version has a well-known problem: it clumps into fibres very readily, which is why nobody could make a long-lasting version of it for years. Cagrilintide is that problem solved, with six changes to the sequence and a fatty chain attached to make it last about a week instead of half an hour.
Supplied for laboratory research use only — not for human or animal use.
Third-party tested by HPLC and LC-MS, ≥99% purity, with a Certificate of Analysis on every order. Ships across Canada.
Technical detail below
Degradation routes specific to Cagrilintide
- Fibrillation — the failure mode specific to this molecular class, and the one its whole design addresses.
- Interfacial aggregation from shaking, foaming, or freeze–thaw, as with any acylated peptide.
- Slow hydrolysis of the fatty-acid linker at extreme pH.
The engineering story is worth knowing because it dictates handling. Two substitutions, N14E and V17R, place oppositely charged residues where they form an intramolecular Glu14–Arg17 salt bridge that stabilises the alpha-helix; the C-terminal prolines break beta-sheet propensity. Physical stability in the discovery work was screened by Thioflavin T fibrillation lag-time assay. The practical consequence is that gentle handling matters more here than for a simple linear peptide.
Freeze–thaw tolerance
Avoid freezing reconstituted material. For an amylin analogue the freeze–thaw concern is not only interfacial aggregation but nucleation of the fibril pathway the molecule was engineered to resist — and fibril formation, once seeded, does not reverse on rewarming.
How storage addresses these routes
Practical window once reconstituted: 3–4 weeks at 2–8 °C.
Full Cagrilintide storage conditionsWhat Cagrilintide is studied for
Cagrilintide binds the calcitonin receptor and all three amylin receptors (AMY1, AMY2, AMY3), which is why the literature sometimes classes it as a dual amylin and calcitonin receptor agonist.
A worked example of engineering a fibril-prone hormone into a stable long-acting analogue — salt-bridge helix stabilisation plus beta-sheet-breaking prolines.
The C20 diacid extends the half-life from minutes, for the short-acting analogue pramlintide, to roughly a week.
The most-studied context: co-administration with semaglutide, investigated in the REDEFINE trial programme.
Summarizes published preclinical literature — see the selected references below. Provided for research reference only; not a claim of efficacy or a description of human use.
- Lau DCW, Erichsen L, Francisco AM, et al. Once-weekly cagrilintide for weight management in people with overweight and obesity: a multicentre, randomised, double-blind, placebo-controlled and active-controlled, dose-finding phase 2 trial. Lancet. 2021.
- Garvey WT, Blüher M, Osorto Contreras CK, et al. Coadministered Cagrilintide and Semaglutide in Adults with Overweight or Obesity. N Engl J Med. 2025.
- Davies MJ, Bajaj HS, Broholm C, et al. Cagrilintide–Semaglutide in Adults with Overweight or Obesity and Type 2 Diabetes. N Engl J Med. 2025.
- Browse current Cagrilintide literature on PubMed
References describe in-vitro and preclinical research and are listed for reference only — not evidence of efficacy and not a description of human use.
More Cagrilintide reference
Lyophilized and reconstituted storage conditions, plus the practical working window.
Diluent selection, dissolution behaviour, and the calculator preset for this compound.
Which solvents work, why, and what abnormal dissolution behaviour indicates.
Which assays are informative for this molecule, and what to actually check on its COA.
Compound-specific bench practices, and the errors most often made with this molecule.
What to inspect on arrival, and which conditions actually warrant rejecting a vial.
Questions specific to this compound — structure, chemistry, and common misconceptions.
Stability reference for other compounds
Reviewed for research-use compliance by Kobi Williams, Founder — Popular Peptides Canada. Last reviewed 22 July 2026.
Cagrilintide is supplied strictly as a research chemical for in-vitro laboratory and research use only. It is not intended for human or animal consumption, diagnostic, or therapeutic use. This page is educational laboratory-handling reference information — not medical advice, not usage guidance, and not a protocol.