What is GLP-1, exactly?
GLP-1 stands for glucagon-like peptide-1. It is a hormone naturally produced and secreted by L-cells in the small intestine in response to food intake. When you eat, your gut releases GLP-1, which then:
- Signals the pancreas to release insulin in a glucose-dependent manner — meaning it only triggers insulin secretion when blood sugar is elevated
- Suppresses glucagon release, reducing the liver’s output of glucose when it is not needed
- Slows gastric emptying, which prolongs the feeling of fullness after eating
- Acts on receptors in the brain involved in appetite regulation and satiety signaling
GLP-1 is a short-lived hormone. Your body degrades it quickly — within minutes of release. The reason pharmaceutical researchers developed GLP-1 receptor agonists is precisely to create longer-acting molecules that activate the same receptors with a duration more suitable for clinical use.
What is Ozempic?
Ozempic is a brand-name prescription drug manufactured by Novo Nordisk. Its active ingredient is semaglutide — a synthetic molecule designed to act as a GLP-1 receptor agonist. Semaglutide is not GLP-1 itself; it is a molecule engineered to activate GLP-1 receptors more durably than the hormone does naturally.
Ozempic was FDA-approved for improving blood sugar control in adults with type 2 diabetes. It is administered as a weekly subcutaneous injection. “Ozempic” is the brand name — semaglutide is the active pharmaceutical molecule.
The same molecule, semaglutide, is the active ingredient in Wegovy — a separate branded product approved specifically for chronic weight management in adults with obesity or with overweight plus a weight-related health condition. Ozempic and Wegovy are distinct branded products with different approved indications and dosing schedules, but they share the same active ingredient.
What other GLP-1 receptor agonists are there?
Ozempic is one product within a broader class of GLP-1 receptor agonists — medications that activate GLP-1 receptors to produce effects similar to the natural hormone. Other notable agents in this class:
- Semaglutide— the active ingredient in Ozempic and Wegovy. A pure GLP-1 receptor agonist. Also available in compounded form through licensed 503A pharmacies under a clinician's prescription (not FDA-approved as a finished drug in that form).
- Tirzepatide — the active ingredient in Mounjaro (type 2 diabetes) and Zepbound (weight management). A dual agonist activating both GLP-1 and GIP receptors. Also available in compounded form through licensed 503A pharmacies. A distinct molecule from semaglutide with a different dual-receptor mechanism and a separate clinical trial record.
- Liraglutide — a once-daily GLP-1 receptor agonist (Victoza for diabetes, Saxenda for weight management), an earlier-generation agent with a different pharmacokinetic profile.
- Dulaglutide — a weekly GLP-1 receptor agonist (Trulicity) approved for type 2 diabetes management.
What is compounded semaglutide, and how does it differ from Ozempic?
Compounded semaglutide has become a significant access pathway for patients pursuing clinician-supervised weight management. Compounded preparations are made by licensed 503A compounding pharmacies under a patient-specific prescription from a licensed clinician.
Compounded semaglutide is:
- Not Ozempic. Ozempic is a branded, FDA-approved finished drug product. Compounded semaglutide is a compounded preparation — a different regulatory category.
- Not a generic of Ozempic. Generics are FDA-approved copies of brand-name drugs. Compounded medications are not generics.
- Not FDA-approved as a finished product. This is a legal distinction any legitimate provider must be transparent about.
- Legal when prescribed and dispensed through the right channels. A valid prescription from a licensed clinician plus a licensed US 503A compounding pharmacy is a legitimate supply chain. PepScribe works exclusively with licensed 503A pharmacies — no hidden overseas supply chain.
Why does the terminology confusion matter?
The way people colloquially use these terms matters for practical reasons. When someone says “I want Ozempic for weight loss,” they often mean they want a GLP-1 receptor agonist for weight management. But the specific term they used — Ozempic — refers to a product with an FDA-approved indication for type 2 diabetes, not for weight management. Wegovy, not Ozempic, is the semaglutide product with an FDA-approved weight management indication.
This terminology gap creates real downstream effects: insurance coverage (Ozempic for diabetes is covered on more plans than Wegovy for weight management), prescribing pathway, and whether compounding is a relevant option all depend on understanding what is actually being discussed.
The short version:
- GLP-1 = the natural hormone and the receptor class
- Semaglutide = the active pharmaceutical molecule
- Ozempic / Wegovy = branded products containing semaglutide, each with different approvals
- Compounded semaglutide= a compounded preparation of the same active molecule, dispensed under a clinician’s prescription through a licensed 503A pharmacy, not FDA-approved as a finished drug
Frequently asked questions
Is GLP-1 the same as Ozempic?
No. GLP-1 (glucagon-like peptide-1) is a naturally occurring hormone your body produces. Ozempic is a brand-name prescription drug that contains semaglutide, a synthetic molecule that activates GLP-1 receptors. "GLP-1" is the hormone class; Ozempic is one branded product within that class.
What is a GLP-1 receptor agonist?
A GLP-1 receptor agonist is a medication that activates the same receptors your body's natural GLP-1 hormone uses. By mimicking or amplifying GLP-1 signaling, these drugs can slow gastric emptying, reduce appetite signals to the brain, and support blood sugar regulation.
Is Ozempic the same as Wegovy?
Both Ozempic and Wegovy contain semaglutide as the active ingredient and are made by the same manufacturer, but they are different branded products with different approved indications and dosing. Ozempic is approved for blood sugar management in type 2 diabetes; Wegovy is approved for chronic weight management.
What is semaglutide?
Semaglutide is a synthetic molecule that acts as a GLP-1 receptor agonist. It is the active ingredient in Ozempic and Wegovy. Semaglutide can also be compounded by licensed 503A pharmacies under a clinician's prescription — the compounded form is not a brand-name product and is not FDA-approved as a finished drug.
Is tirzepatide the same as Ozempic?
No. Tirzepatide (the active ingredient in Zepbound and Mounjaro) is a dual agonist that activates both GLP-1 and GIP receptors, while semaglutide (the active ingredient in Ozempic) activates only GLP-1 receptors. Both are in the broader GLP-1-class category but are distinct molecules with different mechanisms and trial profiles.
Can you get compounded semaglutide without it being Ozempic?
Yes. Compounded semaglutide is prepared by licensed 503A compounding pharmacies under a patient-specific prescription. It is not Ozempic, not a generic of Ozempic, and not an FDA-approved finished drug. It is a compounded preparation of the active pharmaceutical ingredient semaglutide.