Cagrilintide is a long-acting synthetic amylin analogue — a peptide built around the 37-amino-acid structure of human amylin. It comes as a white lyophilised powder, typically in vials of 5 mg or 10 mg, and needs to be kept frozen until use. Here is what you need to know before you order.
What Is Cagrilintide
Cagrilintide is a synthetic peptide derived from the human amylin sequence. Its structure has been modified at several amino acid positions, and a fatty acid tail has been added — a molecular anchor that associates with proteins in the bloodstream and slows how quickly the compound clears. The result is a significantly extended half-life compared with natural amylin, which itself clears within minutes.
Because of its extended half-life, cagrilintide has attracted interest as a research tool for studying amylin-related biochemistry. It is frequently studied alongside other peptide compounds in combination research settings.
Physical Form
Cagrilintide arrives as a lyophilised powder — freeze-dried under vacuum to remove nearly all water. This form is stable at low temperatures and far more durable in transit than a pre-mixed liquid would be.
Common vial sizes in research supply are 5 mg and 10 mg. The 10 mg vial is the more practical choice for extended research work because you open fewer vials and introduce fewer opportunities for contamination.
The powder is white to off-white. If the lyophilisation cake has collapsed into a loose powder that shifts when you tilt the vial, that is worth noting — it can indicate a temperature excursion during shipping, though it does not automatically mean the peptide is damaged.
Storage Temperature
Keep lyophilised cagrilintide at –20 °C (standard freezer temperature) for long-term storage. At this temperature, the dry powder is stable for an extended period when sealed.
If you are working through a vial over several weeks, a brief period at 4 °C (standard fridge) is acceptable — but avoid repeated freeze-thaw cycles. Each cycle puts mechanical stress on the peptide structure and can cause aggregation, where peptide chains clump together.
A few practical rules:
- Freeze unopened vials immediately when they arrive. Do not leave them at room temperature while you deal with other tasks.
- Avoid the freezer door. Temperature swings every time the door opens are worse than a slightly warmer but stable shelf inside the unit.
- Never refreeze a vial once it has been prepared for use.
Light degrades peptides faster than most people realise. Keep vials in their original box or wrap them in foil if you are storing them in a fridge without an opaque door.
Regulatory Landscape
Cagrilintide sits in a regulatory grey area common to synthetic research peptides. It is not a scheduled controlled substance in most jurisdictions, but it is not an approved active pharmaceutical ingredient either. Suppliers in the research chemical space are expected to sell it strictly for laboratory and analytical use — not for any human or animal application.
Regulatory scrutiny of research peptide suppliers has increased in recent years. Authorities in several countries have moved to tighten oversight of compounds that share structural or functional similarities with approved drugs. Suppliers operating in this space are increasingly expected to hold robust documentation — including certificates of analysis from accredited third-party laboratories — and to be transparent about the intended use of their products. Buying from a supplier that maintains clear, up-to-date analytical records is consistent with responsible laboratory practice and supports traceability if questions arise.
Cagrilintide COA
A COA — certificate of analysis — is the document that records what is actually in the vial. Every research-grade cagrilintide vial should come with one, and you should read it before use.
The COA tells you four things that matter:
| Field | What to check |
|---|---|
| Identity | Confirmed by mass spectrometry (measured molecular weight matches the expected ~3,908 Da) |
| Purity | Measured by HPLC; look for ≥98% for research-grade material |
| Appearance | Should match what you received |
| Lot number | Ties this document to a specific production batch |
Purity matters because impurities in a synthetic peptide are not just inert filler — they can be related sequences or truncated fragments, which can complicate interpreting any research data you generate.
Mass spectrometry (MS) is the key identity test. It measures the actual mass of the molecules in the vial. If the mass matches the known sequence of cagrilintide, you have the right compound. If a COA only shows an HPLC trace with no MS confirmation, that is a less complete picture — HPLC measures purity but cannot confirm identity on its own.
Summary
Cagrilintide is a synthetic amylin analogue supplied as lyophilised powder in 5 mg or 10 mg vials. Store it at –20 °C until use and avoid repeated freeze-thaw cycles. Before using any vial in a research setting, read the COA — confirm the molecular weight by mass spectrometry and check that HPLC purity comes in at 98% or above. Those two checks together give you reasonable confidence in what you are working with.
NXT Labs products are sold strictly as research chemicals for in vitro research, laboratory testing and analytical purposes only, and are not intended for use in any human or animal application.
NXT Labs supplies research peptides for laboratory use. Browse the full range or view current Certificates of Analysis.
