I switched from injectable to oral semaglutide for travel reasons and the fasting window is proving harder to hold than the injection ever was.
The practical numbers: about 1% oral bioavailability, 30 minutes fasted before food, no more than 120ml of plain water, and coffee counts as food for this purpose.
What would genuinely help is knowing how much of the oral variability is the SNAC absorption window and how much is dose, because the two get conflated constantly.
Numbers rather than impressions, if you have them.
Short answer first, then the reasoning. Orforglipron is the more interesting oral story because it is not a peptide at all. Being a small molecule it does not need SNAC, does not need the fasting window, and has oral bioavailability in the tens of percent rather than about one.
Dr.PeteFamMed said:Orforglipron is the more interesting oral story because it is not a peptide at all.
That is correct as far as it goes, and here is where it stops going. The absorption variability is real, but it partly averages out over weeks — the steady-state trough is less erratic than any single day would suggest. Where it bites is in the first fortnight, when people conclude the tablet does nothing.
That is the short version; the long version is somebody else's post.
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View ResultsChrisMacros said:I switched from injectable to oral semaglutide for travel reasons and the fasting window is proving harder to hold than the injection ever was.
This matches mine closely enough to be worth saying so. The OASIS programme put 50mg oral in the same territory as 2.4mg injectable — around 15% mean weight loss — but it needed a dose 20 times larger to get there because almost none of the tablet is absorbed. The dose numbers are not comparable across routes and quoting them side by side confuses people.
Adding the clinical framing, because it changes how the question reads. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.