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c/tirzepatide·posted 1 months ago by u/taper_off_tabitha

[Lab] split one vial across PeptideMeter and VendorInvestigate — 98.4% and 97.2%

Lab Long Haul ×2 Receipts ×1 Slow Clap ×3

Posting this because the title is the whole finding — split one vial across PeptideMeter and VendorInvestigate — 98.4% and 97.2% — and a number without its method is a rumour.

98.4% and 97.2%. Those are measured, not estimated, and not rounded up in my favour.

The distribution matters more than the mean. In the trial population the interquartile spread was wide enough that two honest people can have completely different runs on the same arm.

Held 7.5 for five months. Everyone kept asking when I was going to 10. The answer was never, because 7.5 was working.

Please do not ask me what dose you should be on. I genuinely do not know and neither does anyone else here.

2,942 up / 285 down91% upvoted53 commentsid p8hvmu12 Jun 2026

53 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/quiet_moderatorMOD200 points·1 months ago

This is the fifth "should I go up" post today and they are all welcome — but no member here can answer it for you.

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u/sanne_novak123 points·1 months ago

This is the fifth "should I go up" post today and they are all welcome — but no member here can answer it for you.

quiet_moderator is right that the two molecules are not interchangeable. There is no published conversion and the ones circulating are invented.

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[removed]75 points·1 months ago

[removed by moderator]

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u/tarek_lokken52 points·1 months ago

It is a dual GIP and GLP-1 receptor agonist, and the GIP arm is the part that has no equivalent in the semaglutide threads. That is why the side-effect profile reads differently rather than just milder.

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u/quiet_moderatormod44 points·1 months ago·edited

the appetite effect is blunter than sema, in a good way, most weeks

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u/line_petrov83 points·1 months ago

Vials and pens carry the same molecule; what differs is fill volume, device tolerance and whether you are doing your own arithmetic. Neither is inherently more accurate.

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u/tidy_vialdrawer_pls-37 points·1 months ago

The four-week interval in the label is a minimum. Nothing about the pharmacology requires you to step on schedule, and the trials stepped on a calendar because trials have to.

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u/rania_diallo88 points·1 months ago

Sulphur burps for the first eight days after each step, then nothing. Predictable enough that I planned my week around it.

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u/thyroid_tangent102 points·1 months ago

Weekly dosing again, half-life in the same neighbourhood as sema, so a step change takes about a month to reach steady state. Judging a new step at day five is judging noise.

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u/incretin_ivypharmacology90 points·1 months ago

the trials titrated on a calendar, real people titrate on symptoms

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u/yusuf_ramos56 points·1 months ago·edited

the trials titrated on a calendar, real people titrate on symptoms

Not sure about this bit. The GIP arm being real does not tell you that it is what caused your particular week.

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u/laila_yilmaz30 points·1 months ago

Agree. The GIP component is the interesting half and it barely gets discussed outside c/glp1science.

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u/ahmed_fonseca51 points·1 months ago

the muscle cramps profile is genuinely gentler than people expect coming from sema

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u/hana_pereira33 points·1 months ago·edited

Push back: "gentler than sema" is a population statement. Plenty of people on this board have the opposite experience and they are not doing it wrong.

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u/endpoint_creep26 points·1 months ago

Research-use-only material is not approved for human use. Anything in this thread about how a research vial "should" titrate is a discussion about chemistry, not a plan.

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u/taper_off_tabithaOP10 points·1 months ago

Are you comparing yourself with the trial mean or with the people who post the most?

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u/taper_off_tabithaOP4 points·1 months ago

Week 74 was the first time the scale moved after a five-week stall. I changed nothing in that window.

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u/nabila_ogunleye3 points·1 months ago

week 3 is early to draw any conclusion at all

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u/taper_off_tabithaOP1 point·1 months ago

Came off sema and onto tirz with a two-week gap. The first month was flat and I assumed I had made a mistake. Month two it moved.

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u/forest_plot_fionastats4 points·1 months ago

SURMOUNT-1 ran 72 weeks with the top arm around 21% mean body weight change. SURPASS is the diabetes programme and reports glycaemic endpoints, so quoting the two interchangeably is a category error.

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u/sanne_novak7 points·1 months ago

Yes. I stepped to 12.5 because the calendar said so, not because anything needed fixing, and I regretted it for a fortnight.

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u/sten_palacios2 points·1 months ago

SURMOUNT-1 landed around 21% at 72 weeks on the top arm

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u/kaia_wojcik5 points·1 months ago

The 21% figure is a 72-week mean on the highest arm. Quoting it as what someone should expect by week 86 is not a fair reading.

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u/samir_falk14 points·1 months ago

dual agonist, so the GIP arm is doing something the sema threads will not tell you about

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u/mikkel_ogunleye9 points·1 months ago

That percentage is body weight change, not body fat. Different measurement, and the distinction gets lost every time.

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u/gustav_vermeulen7 points·1 months ago

switching from sema is not a dose conversion, there is no clean equivalence

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u/elin_ferrari10 points·1 months ago

a lot of people plateau nicely at 10mg and never need 15

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u/nz_unfunded3 points·1 months ago

switching from sema is not a dose conversion, there is no clean equivalence

Agreed, with one qualifier: that is the mean of the top arm and the spread around it was enormous.

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About c/tirzepatide

Tirzepatide-specific discussion: the dual-agonist pharmacology, the 2.5 → 15mg ladder, the appetite profile people describe as different from semaglutide, and the SURMOUNT/SURPASS trial programme. Comparisons with semaglutide are welcome as long as they are specific about dose equivalence being unknown.

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