GLP-1 is a hormone your gut already makes
Glucagon like peptide 1 is released after you eat. It tells the pancreas to release insulin, slows how fast the stomach empties, and signals fullness to the brain. The natural hormone breaks down within minutes.
A GLP-1 receptor agonist is a drug that binds the same receptor and stays active far longer. Every medicine in this class does the same job. What separates them is chemistry and how they are delivered.
Peptides are destroyed by the stomach, which is why the first ones were injected
Semaglutide is a peptide, a short chain of amino acids. Swallowed on its own it is broken apart by stomach acid and digestive enzymes before it can be absorbed. Injection avoids the stomach entirely, which is why the class arrived as a weekly shot.
Making a peptide work as a tablet requires an absorption enhancer. Oral semaglutide is formulated with a carrier that raises the pH immediately around the tablet and helps the drug cross the stomach lining. That carrier is the reason oral semaglutide has historically come with instructions about timing, water volume and waiting before eating.
Orforglipron takes a different route: it is not a peptide at all
Orforglipron is a small molecule. It was designed to activate the GLP-1 receptor without being a protein, so digestion does not destroy it and no absorption enhancer is needed. That is what allows it to be taken at any time of day, with or without food or water.
The practical result is two approved oral medicines that reach the same receptor by different chemistry.
What this does not change
Route of delivery does not alter the side effect profile in kind. Nausea, constipation and other gastrointestinal effects are common to the class and appear with tablets as they do with injections.
This article explains mechanism. It is not medical advice, and it cannot tell you whether any of these medicines suit you. That conversation belongs with your doctor or pharmacist.