The Peptide CommonsEst. May 2024
Independent. We sell nothing and are affiliated with no manufacturer or pharmacy. Every moderation action is logged in public
Topic summary

Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one

This is a generated summary. It shows the 9 most-liked posts from a topic of 136, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.
GR
gradient_reviewTL2Member Solution12 Oct 2025 · edited#4
br.wikstrom, post #3: I had written a reply contradicting the opening post and deleted it. Here is what survived. On variability: the between-person spread in exposure for oral semaglutide is wide enough that two people on the same dose can have quite different plasma concentrations. That is inherent to the absorption route. The claim is narrower than it… Go to post

Excipients are not inert from an analytical point of view. A certificate for a formulated tablet has to account for them, and one that reports a purity figure without saying what the figure is a proportion of is ambiguous.

If the premise is wrong, everything after it is decoration.

27 likes in reply to #3 10mo
CL
c.lundgrenTL231 Oct 2025#24

Picking up post #21: that is the part I would want checked first.

Oral semaglutide's bioavailability is low and variable, which is why the dose numbers are an order of magnitude different from the injectable. That is a formulation consequence and not a difference in potency.

Happy to be the one who is wrong here if it settles the question.

30 likes 9mo
D
DOdendaalTL3Regular6 Nov 2025#32

Where I part company with post #30, and it is a narrow parting.

On variability: the between-person spread in exposure for oral semaglutide is wide enough that two people on the same dose can have quite different plasma concentrations. That is inherent to the absorption route.

The strength of my opinion here exceeds the strength of my evidence.

32 likes 9mo
PD
p.dialloTL211 Nov 2025#39
DOdendaal, post #32: Where I part company with post #30, and it is a narrow parting. On variability: the between-person spread in exposure for oral semaglutide is wide enough that two people on the same dose can have quite different plasma concentrations. That is inherent to the absorption route. The strength of my opinion here exceeds the strength of my… Go to post

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.

I would rather be precise about what I do not know than vague about what I do.

31 likes in reply to #32 9mo
SR
s.roosTL220 Nov 2025#52

PIONEER 6 is the cardiovascular outcome trial for oral semaglutide and it enrolled a diabetes population at high cardiovascular risk. Quoting it outside that population is an extrapolation.

The mechanism is plausible, which is not the same as established.

29 likes 8mo
RD
r.danquahTL230 Nov 2025 · edited#67

Anyone comparing published oral and injectable efficacy should check whether the comparison is within one trial or across two. Across two, the populations differ and the comparison is weak.

None of the above is medical advice and I am not qualified to give any.

29 likes 8mo
SR
s.rasmussenTL26 Dec 2025 · edited#77
m.almeida, post #20: 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. Anyone with a larger sample, please post it. Go to post

Understood, and I withdraw the assumption I opened with.

31 likes in reply to #20 8mo
K
KLindqvistTL4 Moderator15 Dec 2025 · edited#92

Missed doses behave differently for a daily oral than for a weekly injection. With a short interval you are near a trough rather than perturbing a slowly moving average, and the labelling reflects that.

I am describing what is, rather than arguing for what should be.

31 likes 7mo
K
KnowltonTL3Regular19 Dec 2025 · edited#99
e.okafor, post #79: PIONEER 6 is the cardiovascular outcome trial for oral semaglutide and it enrolled a diabetes population at high cardiovascular risk. Quoting it outside that population is an extrapolation. On reflection I would soften that slightly. Go to post

Dose equivalence between oral and injectable formulations is not a simple conversion and no published factor should be used as one. The two were developed and titrated separately.

30 likes in reply to #79 7mo

Read the full topic (136 posts)

Suggested topics

TopicParticipantsRepliesViewsActivity
Why fasting instructions for oral semaglutide are not optional advice — does this still hold?
Asking directly, because I could not find a straight answer: Why fasting instructions for oral semaglutide are not optional advice — does this still hold? A methods question rather than a substantive one,…
MVEBATJSI+98 106 3.1k 10mo
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes
The SOUL trial and oral semaglutide cardiovascular outcomes — setting out what I have, and where I think it stops being reliable. SOUL trial and oral semaglutide — I have the observation and I do not trust my…
TWBTAMDRM+100 104 4.2k 5mo
Food effects on oral incretin absorption: what is documented
On the subject in the title: Food effects on oral incretin absorption: what is documented Working notes rather than a conclusion. Food effects on oral incretin, from the point of view of someone who has read…
RMRVAP 2 4.4k 12mo
Why fasting instructions for oral semaglutide are not optional advice
Why fasting instructions for oral semaglutide are not optional advice I have a specific reason for asking rather than idle curiosity, and the context is below. Fasting instructions for oral semaglutide, from…
HFGHNNJAS+70 74 1.1k 23d
SNAC and the mechanism of oral peptide absorption
On the subject in the title: SNAC and the mechanism of oral peptide absorption Working notes rather than a conclusion. A comparison question rather than a question about one compound. Two things in the same…
PNJPTKGOF+13 17 14k 17mo

Related topics — sharing the tags oral semaglutide, randomised trial, PIONEER programme

TopicParticipantsRepliesViewsActivity
Second pass at: Reading a combination trial: attributing effect to components
Second pass at: Reading a combination trial: attributing effect to components — setting out what I have, and where I think it stops being reliable. The question about Reading a combination trial that I…
ELPBLCMNBP+39 43 7.3k 12mo
Tirzepatide molecular mass and the charge states you would expect on ESI
Tirzepatide molecular mass and the charge states you would expect on ESI Writing it up because I had to work it out twice and would rather nobody else did. Tirzepatide molecular mass keeps being re-asked here…
CRBEMVDTV+36 40 44k 11mo
Journal club: STEP 8 and the fairness of the comparator dose — a second dataset
Posting this under the heading it deserves: Journal club: STEP 8 and the fairness of the comparator dose — a second dataset Everything below is what sits behind that. Posting a small dataset on STEP 8. It is…
OLIADSRFDO+18 22 656 13h
Trial registration and comparing the protocol with the paper
Trial registration and comparing the protocol with the paper — setting out what I have, and where I think it stops being reliable. I have spent a fortnight trying to pin trial registration down and I want to…
AIRDRVOVAV+38 44 4.8k 10mo
Why fasting instructions for oral semaglutide are not optional advice
Why fasting instructions for oral semaglutide are not optional advice I have a specific reason for asking rather than idle curiosity, and the context is below. Fasting instructions for oral semaglutide, from…
HFGHNNJAS+70 74 1.1k 23d