Levels
Why the same Wegovy pill hits two people so differently
Because the tablet absorbs so little, and that little varies. The label says that on 25 mg tablets, 90 percent of people had blood concentrations between 27 and 186 nmol/L, a sevenfold spread, against 51 to 110 on the injection. One person's rough week and another's quiet month can both be inside that range.
DM, the one who read the label
Sources checked Sep 28, 2026
Published Oct 2, 2026
Updated Oct 7, 2026 · 2 min read
The short answer
Because the tablet absorbs so little, and that little varies. The label says that on 25 mg tablets, 90 percent of people had blood concentrations between 27 and 186 nmol/L, a sevenfold spread, against 51 to 110 on the injection. One person's rough week and another's quiet month can both be inside that range.
What the label says
The pharmacology section compares the two forms with a range rather than an average.
On the 25 mg tablet, concentrations are predicted to be comparable to the 2.4 mg weekly injection, with higher variability. Then the numbers: 90 percent of people on the tablet between 27 and 186 nmol/L; 90 percent on the injection between 51 and 110.
The middle is similar. The edges are not. The lowest tablet users sit at half the lowest injection users, and the highest at nearly twice the highest.
Where the spread comes from
The injection puts 89 percent of its dose into the body, every week, regardless of breakfast. The tablet puts about 1 to 2 percent through the stomach wall, and that share depends on how empty the stomach was, how much water, how long the wait, and on the person. A small share that moves by a factor of two is a big difference in the blood. That is the whole story of the variability, and it is why the label keeps repeating its morning rules.
What it means for comparing notes
Two people on the same strength, same month, can be at opposite ends of that range. One feels the tablet from day three; the other feels nothing until 9 mg. One has a rough week of nausea; the other sails. The forums are full of both, arguing about who is doing it wrong, and the label's answer is that neither necessarily is.
It also explains the two sentences the label adds for people with type 2 diabetes: that some may reach concentrations below what works, and that an inadequate response on the tablet is a reason to consider the injection.
You can draw it yourself, missed mornings included, on the pill level chart.
What people actually do
Comparing is the forum's main activity, and the tablet makes comparisons unreliable. People who understand the spread stop asking "is this normal" of strangers and start keeping their own record: the mornings that went right, the days on each step, how the stomach did, what the appetite did. That record, not someone else's, is what the prescriber can use.
Oolite keeps it: the mornings, the steps, the journal, and a level chart built on the label's half-life for this person's own schedule, never someone else's.
Questions people ask
Why does the tablet vary more than the injection?
The injection delivers 89 percent of its dose under the skin, every time. The tablet delivers about 1 to 2 percent through the stomach, and that share moves with the morning, the water, the wait and the person. Small share, big relative swings.
Does it mean my tablet is not working?
It means one person's experience is a poor guide to another's. The label says concentrations on the tablet are comparable to the injection on average; the spread is around that average. Whether yours is working is a question for your prescriber, with your own numbers.
Can I have my level measured?
A semaglutide blood test is not something the label describes for routine care. The prescriber reads response and tolerability, which is why the label's escalation decisions are written in those words.
Is the spread the same on Foundayo?
Foundayo's label gives an absolute bioavailability of 77 percent and no food effect, so its exposure moves much less with the morning. It has its own person-to-person variation, like any drug, but not the tablet-versus-injection gap.
Sources
- Wegovy prescribing information, Novo Nordisk, §12.3, revised 06/2026 · Oral 25 mg concentrations comparable to 2.4 mg injection with higher variability; 90 percent of patients between 27 and 186 nmol/L on the tablet vs 51 to 110 on the injection; bioavailability 89 percent vs about 1 to 2 percent.
Sources checked Sep 28, 2026. This page is information, not medical advice: read the medical disclaimer, and talk to your prescriber or pharmacist about your own treatment.
Written by
DM, the one who read the label
I make Oolite. I read every label revision the day it comes out and rewrite these answers when they change.
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