THE CATEGORY
GLP-1 for Fat Loss — What the Category Actually Is
GLP-1 is a hormone, not a product. The phrase "GLP-1 for fat loss" has come to mean a whole class of compounds that act on its receptor — and the class is where the useful distinctions live.
Glucagon-like peptide-1 is an incretin: a gut hormone released after eating that acts on receptors in the pancreas and the brain. Compounds described as "GLP-1s" are receptor AGONISTS — molecules engineered to bind that receptor and resist the enzyme that clears the natural hormone in minutes. That resistance, not novelty of target, is what made the class practical.
The class then splits by how many receptors a molecule engages. Single-agonist compounds act on GLP-1 alone. Dual agonists add GIP, a second incretin receptor — tirzepatide is the best-documented example. Triple agonists add glucagon receptor activity on top; retatrutide is the compound at that end of the literature. More receptors is not automatically "better" — it is a different pharmacology, and the research questions differ accordingly.
The distinction that matters commercially in South Africa is REGULATORY, not chemical. Some molecules in this class are registered prescription medicines, made under pharmaceutical quality systems and dispensed by pharmacies against a prescription. Others exist only as research compounds, unregistered, supplied to laboratories for study. A compound can be well documented in the literature and still not be a medicine, and no amount of documentation converts one into the other.
We supply the second kind: retatrutide and tirzepatide as HPLC-verified lyophilised research vials, with a Certificate of Analysis per batch, held in stock in Johannesburg. What they are not is a treatment, a prescription, or a substitute for one.
Side by side
What it is
A registered medicine with a SAHPRA registration number
An unregistered research compound
How you get it
Prescription from a registered healthcare provider, dispensed by a pharmacy
Ordered by a researcher for laboratory use
Quality system
Pharmaceutical manufacturing standards, regulator-inspected
Third-party HPLC and MS verification, CoA per batch
Permitted use
The indication on its approved label
Laboratory research only — not human or veterinary use
Clinical oversight
A prescriber who knows your history
None. We are a supplier, not a clinic
What we hold in stock
Read live from inventory. Supplied for laboratory research purposes only.
Retatrutide
LY3437943 (GLP-1/GIP/Glucagon Receptor Triagonist)
Tirzepatide
LY3298176 (GIP/GLP-1 Receptor Dual Agonist)
Buying quantity? Trade pricing is 25% off from 10 vials — build and price an order in the browser.
Questions
What does GLP-1 stand for?
Glucagon-like peptide-1, an incretin hormone released by the gut after eating. Compounds called "GLP-1s" are receptor agonists engineered to bind that receptor and last far longer than the natural hormone, which is cleared within minutes by the DPP-4 enzyme.
What is the difference between a single, dual and triple agonist?
The number of incretin receptors the molecule engages. Single acts on GLP-1; dual adds GIP (tirzepatide); triple adds glucagon receptor activity (retatrutide). It describes pharmacology, not a ranking.
Which GLP-1 research compounds do you stock?
Retatrutide and tirzepatide, both as lyophilised research vials in more than one size, held in stock in South Africa with live stock counts and a batch-specific Certificate of Analysis.
Can I use these for weight loss?
No. They are supplied strictly for laboratory research purposes — not for human or veterinary use, not medicines, and not registered with SAHPRA. If you are looking for treatment, that conversation belongs with a registered healthcare provider.
Read next
Every compound we supply is sold strictly for laboratory research purposes only. Not for human or veterinary use, not a medicine, and not registered with SAHPRA. Nothing on this page is medical advice, a dosing instruction or a claim of any outcome.