Peptides studied in metabolic and weight research

Research reference

Several peptide classes are studied in metabolic research for their effects on appetite signalling, insulin response and energy balance. This page summarises those classes and the compounds most often referenced, with links to the per-compound identifier and literature pages. It describes published research mechanisms only; nothing here is a weight-loss product, a dosing recommendation or a claim of effect in humans.

An important note on intended use

The compounds below are supplied as research reference materials, not for human or veterinary use. Where a licensed medicine corresponds to one of these molecules it is a prescription-only medicine for human use; see Are peptides legal in the UK?. This page explains research mechanisms for orientation and makes no claim that any compound causes weight loss in people.

Incretin mimetics (GLP-1, GIP and glucagon receptors)

The incretin hormones GLP-1 and GIP modulate insulin secretion, gastric emptying and satiety signalling. Synthetic agonists in this class are the most heavily studied metabolic peptides:

  • Semaglutide — a GLP-1 receptor agonist.
  • Tirzepatide — a dual GLP-1/GIP receptor agonist.
  • Retatrutide — an investigational triple GLP-1/GIP/glucagon receptor agonist.

Each reference page binds the compound to its CAS, InChIKey and PubChem identifiers and to selected PubMed literature.

Amylin analogues

Amylin is co-secreted with insulin and contributes to satiety and slowed gastric emptying. Cagrilintide is the long-acting amylin analogue most often studied alongside the incretin agonists in metabolic research.

Lipolytic and mitochondrial-derived peptides

A separate research line concerns peptides acting on fat metabolism and mitochondrial function rather than incretin signalling:

  • AOD-9604 — a fragment of human growth hormone (residues 176–191) studied for lipolytic activity.
  • MOTS-c — a mitochondrial-derived peptide studied in metabolic regulation and exercise physiology.

How these are supplied for research

All of the above are supplied lyophilised, characterised by HPLC for purity and mass spectrometry for identity, with a per-batch Certificate of Analysis. They are research reference materials only. For the broader background see What are peptides?.

Frequently asked questions

Which peptides are studied for weight and metabolism?
The most studied are the incretin agonists semaglutide (GLP-1), tirzepatide (GLP-1/GIP) and retatrutide (GLP-1/GIP/glucagon), the amylin analogue cagrilintide, and the lipolytic/mitochondrial peptides AOD-9604 and MOTS-c.
What is the difference between semaglutide, tirzepatide and retatrutide?
They differ in how many incretin receptors they engage: semaglutide targets GLP-1, tirzepatide is a dual GLP-1/GIP agonist, and retatrutide is an investigational triple GLP-1/GIP/glucagon agonist.
Are these weight-loss peptides legal in the UK?
Where a licensed medicine exists the molecule is prescription-only for human use; retatrutide is investigational. All are supplied here as research reference materials, not for human use. See our UK legal-status guide.
Are these supplied for human use?
No. Every compound is supplied as a research reference material only, with no dosing guidance and no claim of effect in humans.

Compound references

Related guides

Research-grade peptides from NMChem

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