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c/tirzepatide·posted 28 days ago by u/nordic_pricing

[Question] does the vial concentration change how much dead space costs me

Question Long Haul ×2 Cold Box ×3

Question in the title, detail here: does the vial concentration change how much dead space costs me.

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.

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

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.

Screenshot none of this. Read the whole thread, including the parts where I am told I am wrong.

1,722 up / 105 down94% upvoted58 commentsid qwccap1 Jul 2026

58 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/kofi_balogun90 points·27 days 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/ewan_marchand28 points·27 days ago

This matches mine. Milder muscle cramps than I expected, and what there was settled inside a fortnight of each step.

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u/sofia_nascimento24 points·27 days ago

What is the waist doing? That is usually the number still moving during a scale stall.

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u/vito_chowdhury53 points·28 days 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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[deleted]39 points·28 days ago

[deleted]

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u/ignacio_vanhecke10 points·27 days ago

22kg over 53 weeks, never went past 10mg, and food noise stayed mild the whole way. Posting because the loud threads are all 15mg.

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u/taper_off_tabitha42 points·28 days 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/nordic_pricingOP26 points·28 days ago·edited

Research-use-only material is not approved for human use.

Saving this one. It is the clearest statement of the stall problem I have read here.

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u/graph_it_gary8 points·27 days ago

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

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u/copay_card_cc4 points·27 days ago

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/marta_dziedzic3 points·27 days ago

The 21% figure is a 72-week mean on the highest arm. Quoting it as what someone should expect by week 24 is not a fair reading.

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u/samir_falk2 points·27 days ago

2.5 is the starter dose and it is not meant to be the dose that works

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u/fatima_wojcik7 points·27 days ago

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

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u/nordic_pricingOP5 points·27 days ago

Small fix: SURMOUNT is the obesity programme, SURPASS is the type-2 programme. They are different endpoints and the numbers do not transfer.

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u/priya_guerrero28 points·27 days 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/teodor_szabo16 points·27 days ago

the injection-site soreness profile is genuinely gentler than people expect coming from sema

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u/nordic_pricingOP9 points·27 days ago

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

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u/b12_baseline3 points·26 days ago

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

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u/noor_hovland1 point·26 days 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/kian_ekstrom2 points·27 days ago

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

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u/quiet_moderatorMOD15 points·27 days 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/dario_vermeulen5 points·27 days ago

2.5mg is a four-week starting dose, not a maintenance dose. Worth being precise since people search these threads.

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u/ferritin_low2 points·26 days ago

zepbound and mounjaro are the same compound with different labels

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u/bastian_ekstrom-38 points·26 days ago

Week 43 was the first time the scale moved after a five-week stall. I changed nothing in that window.

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u/hair_shed_hannah2 points·26 days ago

sulphur burps are the signature complaint and they are not dangerous

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u/nabila_ogunleye2 points·26 days ago

sulphur burps are the signature complaint and they are not dangerous

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/noor_hovland11 points·27 days ago

The thing nobody warned me about was how much of this is logistics — storing it, remembering it, the same day every week.

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u/nz_unfunded9 points·27 days ago

hold the dose that works, the ladder is not a leaderboard

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u/elin_ferrari9 points·27 days ago

week 8 is early to draw any conclusion at all

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u/hub_opssite staff2 points·27 days ago

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

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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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