SNAC (oral semaglutide absorption enhancer)

Semaglutide is a peptide, which is to say a small protein. Swallow a protein and your stomach treats it as food: acid and enzymes break it apart long before it can reach the bloodstream. That is why every GLP-1 in this class started as an injection. Making a semaglutide tablet required solving the absorption problem, and the solution has a name printed in the ingredients list.

Salcaprozate sodium — abbreviated SNAC — is listed on the Rybelsus and Ozempic tablet label as an absorption enhancer. It co-formulates with semaglutide and creates a small local environment in the stomach where the peptide survives long enough to cross the stomach lining. Without it, an oral semaglutide tablet would deliver essentially nothing.

The catch is that this local effect is fragile, and the dosing instructions exist to protect it. The label is unusually specific: take the tablet once daily on an empty stomach in the morning with no more than four ounces of water, no other liquid, swallow it whole without splitting or crushing, and then wait at least 30 minutes before eating, drinking anything else, or taking other oral medications. Food in the stomach disrupts the process.

The common confusion is treating that 30-minute rule as a suggestion, the way you might with a vitamin. It is not a comfort instruction — it is an absorption instruction, and skipping it means a smaller and less predictable dose. The other frequent mix-up is assuming every oral GLP-1 works this way. Foundayo (orforglipron) is a small non-peptide molecule rather than a peptide, so it needs no absorption enhancer and its label allows dosing with or without food.

Worth asking your clinician or pharmacist: how to slot the tablet into a morning that already includes thyroid medication or a proton-pump inhibitor, what to do on a day you forget and eat first, and whether a once-daily routine is realistic for you at all. Our oral GLP-1 questions hub collects the practical answers.