Signalling, not willpower
Energy balance is regulated by a set of hormonal signals passing between the gut, the pancreas and the brain. The bulk of current peptide work sits at the receptors that carry those signals, in particular GLP-1 and the two receptors most often studied alongside it. That question is mechanistic, and mechanism is the part of this field with real data behind it.
If you want the route itself explained before looking at any compound, start with the GLP-1 pathway. It is the page the rest of this area keeps referring back to.
Searching for peptides for weight will bring back at least three different receptor stories, and telling them apart is the substance of this area rather than a footnote to it. Single-receptor, dual-receptor and triple-receptor constructs are studied alongside each other precisely because they are not equivalent: the three-way comparison sets the published record side by side, and the GLP-1 and GLP-3 comparison covers where a catalogue name and a receptor profile part company. How far the newest of them has actually travelled is set out in the registry entries on ClinicalTrials.gov, where each trial appears with its current status. The one compound in this area that is not an incretin construct at all is AOD-9604, a fragment of growth hormone with a separate research history.
What is being investigated- Receptor binding affinity and downstream signalling
- Gastric emptying rate and satiety signalling
- Adipose tissue distribution and lipolysis
- Glucose handling and insulin sensitivity
The same name, two different products
A number of these molecules are also registered as prescription medicines: dispensed through a pharmacy, backed by a regulatory dossier. What we supply is research material. The molecule may share a name, but the two sit in separate legal categories and only one of them was ever intended for a person.
Where an authorised product is the reference point, its assessment is public: the European file for Wegovy at the EMA shows the evidence a regulator required before approval. None of that dossier travels with research material sold under the same molecule name.
Anti-doping note
Several molecules in this area appear on the WADA prohibited list. If you compete under a sporting federation, check the current version of that list yourself before ordering anything at all.
How to read a COACompounds studied here
Four molecules, all research grade, all released at 99% or higher by HPLC with the certificate available per batch.
Four things this page will not do
Most writing on this topic exists to move product. This page exists to survive being checked. Here is what we leave out on purpose.
Read before you order
Four pages that cover the mechanism, the individual compounds and what the trial protocols actually recorded.
The GLP-1 pathway
How the signalling route works and why three molecules on it are not interchangeable.
Read OverviewWeight loss injections
A shorthand term covering several unrelated molecules. Which ones people usually mean.
Read SafetyRetatrutide side effects
The frequencies written into the trial protocols, quoted as the papers give them.
Read QualityHow to read a COA
Which lines on the certificate carry weight, and which questions it cannot answer.
ReadQuestions about this area
The ones we get most often, answered as plainly as we can.