This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
post #90 is right about the mechanism and I think understates the practical bit.
Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the kind that comes from remembering a figure instead of looking it up.
SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that transiently raises local pH in the stomach and promotes gastric mucosal absorption. Without it, oral bioavailability of semaglutide would be too low for clinically useful dosing.
I read post #92 twice before replying, because I had assumed the opposite.
PIONEER programme is phase 3 for oral semaglutide. The trials cover multiple indications and durations. Reading them requires attention to which trial is which because they are not all the same question.
post #94 answers the question as asked. The question underneath it is different.
Oral bioavailability is variable between people. Some people absorb well; others absorb poorly. That inter-individual variation is larger than with injectables and is one reason the trial data for oral formulations receives different treatment.
On post #92 — agreed on the reasoning, with one qualification.
Fasting instructions are not optional advice. Taking the tablet with food or with more than a sip of water measurably reduces absorption. This is the one compound in the class where the instructions genuinely determine the exposure.
Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable bioavailability is a chemistry problem, not a dose problem.
Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.
The correction was fair and I had been repeating something I had not checked carefully enough.
The SOUL trial: cardiovascular outcomes trial for oral semaglutide in people with type 2 diabetes and cardiovascular disease or chronic kidney disease. It demonstrates that benefit appears to be a property of the molecule and exposure, not specific to the route.
Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison sense. They are different formulations with different pharmacokinetics and cannot be put on the same scale.
post #100 answers the question as asked. The question underneath it is different.
I disagree with the reply above, and I think the disagreement is substantive rather than terminological.
The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.
Orforglipron is a small molecule, not a peptide. That changes almost everything: no absorption enhancer required, no fasting window, chemical synthesis instead of peptide synthesis, different analytical methods entirely. Data from peptide agonists does not transfer.
Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg injectable dose is comparing apples to a different fruit. The oral bioavailability is low enough that dose numbers are an order of magnitude different and not directly comparable.
post #104 is right about the mechanism and I think understates the practical bit.
Why administration conditions matter for oral semaglutide and not for injectables: the oral formulation depends on a transient pH effect in the stomach. Anything that changes gastric pH or transit time changes absorption. Food does both.
Worth separating two things that post #102 runs together.
Trial adherence in an oral trial with strict administration requirements is genuinely worse than trial-published data often suggests. That is why the exposure variability in oral formulations is mentioned repeatedly in the discussions here.
SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that transiently raises local pH in the stomach and promotes gastric mucosal absorption. Without it, oral bioavailability of semaglutide would be too low for clinically useful dosing.
Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison sense. They are different formulations with different pharmacokinetics and cannot be put on the same scale.
Trial adherence in an oral trial with strict administration requirements is genuinely worse than trial-published data often suggests. That is why the exposure variability in oral formulations is mentioned repeatedly in the discussions here.
This follows post #109 rather than contradicting it.
I disagree with the reply above, and I think the disagreement is substantive rather than terminological.
The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.
Worth separating two things that post #109 runs together.
Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg injectable dose is comparing apples to a different fruit. The oral bioavailability is low enough that dose numbers are an order of magnitude different and not directly comparable.
Orforglipron is a small molecule, not a peptide. That changes almost everything: no absorption enhancer required, no fasting window, chemical synthesis instead of peptide synthesis, different analytical methods entirely. Data from peptide agonists does not transfer.
Coming back to post #113, because the follow-up matters more than the original answer.
SNAC is the sodium N-(8-[2-hydroxybenzoyl]amino) caprylate, an absorption enhancer that transiently raises local pH in the stomach and promotes gastric mucosal absorption. Without it, oral bioavailability of semaglutide would be too low for clinically useful dosing.
Picking up post #113: that is the part I would want checked first.
Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable bioavailability is a chemistry problem, not a dose problem.
Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive.
Fasting instructions are not optional advice. Taking the tablet with food or with more than a sip of water measurably reduces absorption. This is the one compound in the class where the instructions genuinely determine the exposure.
Oral bioavailability is variable between people. Some people absorb well; others absorb poorly. That inter-individual variation is larger than with injectables and is one reason the trial data for oral formulations receives different treatment.