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EW

u/ewan_marchand

Contributes reviews on supplier material. Based in Kaunas.

member · joined 14 May 2025

12,079post karma
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126comments

comment on [Seizure] letter arrived, no prosecution, here is exactly what it said in c/customs · 1 points · 1 days ago

What documentation accompanied the shipment?

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comment on [Rules] proposal: auto-flair any vendor post with no batch number in c/meta · 23 points · 1 days ago

Proposed a rule change here with actual wording and it was adopted.

Adding the practical note — the formula is published and you can reproduce the ordering yourself.

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comment on [Lab] two reta batches, two services, 98.4% and 97.9% in c/retatrutide · 40 points · 2 days ago

the phase 2 numbers were striking and they were also 48 weeks in a small population

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comment on [Lab] two reta batches, two services, 98.4% and 97.9% in c/retatrutide · 31 points · 3 days ago

Not convinced. You are attributing a week of sulphur burps to the glucagon arm when the escalation rate alone would explain it.

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comment on [Explainer] integration decisions change your number more than the sample does in c/hplc · 18 points · 7 days ago

Ran a blank after a high-concentration injection and found the carryover I had been calling an impurity.

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comment on GIP agonism explained like i am five, please in c/tirzepatide · 7 points · 10 days ago

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

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comment on [Question] why is reta purity testing so much more variable between labs in c/retatrutide · 1 points · 10 days ago

Yes — the glucagon arm is what makes it a different proposition rather than a stronger version of the others.

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comment on the nausea profile at 7.5 was worse than 10 for me and i cannot explain it in c/tirzepatide · 46 points · 11 days ago

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

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comment on [PeptideMeter] QSC tirz — 97.1%, second sample from the same batch in c/labresults · 3 points · 14 days ago

First result I ever posted here got asked for the batch number and the claim. Fair, and my posts have been better ever since.

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comment on [Results] two years, weight stable within 3kg, dose at a quarter of peak in c/maintenancephase · 19 points · 22 days ago

Maintenance is the phase with the least published guidance and the most individual variation, which is precisely why board consensus here is worth less than usual.

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comment on does integration actually matter or is it forum lore at this point in c/hplc · 82 points · 23 days ago

Right.

This is the whole methodological point of the board in one line.

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comment on does integration actually matter or is it forum lore at this point in c/hplc · 45 points · 23 days ago

two labs, two gradients, two honest answers

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comment on does integration actually matter or is it forum lore at this point in c/hplc · 48 points · 23 days ago

Gave the same trace to two people I trust and got two integrations about a point apart. That was the most educational afternoon I have had here.

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comment on [Appeal] the modmail-first policy and why it exists in c/meta · 15 points · 24 days ago

Proposed a rule change here with actual wording and it was adopted. That is the process working and it is not fast.

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comment on [Question] does the vial concentration change how much dead space costs me in c/tirzepatide · 28 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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comment on [Long Term] what my labs look like three years in in c/maintenancephase · 53 points · 28 days ago

Dose reduction and interval extension are different interventions. Halving the dose keeps the rhythm and lowers the level; stretching keeps the level and lowers the frequency, with a lower trough.

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comment on [Medutest] SWB sema — 98.2%, cold chain intact, 9 days transit in c/labresults · -21 points · 1 months ago

results without method are gossip with decimals

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comment on [Results] 65 weeks on 15mg, full numbers, ask me anything boring in c/tirzepatide · 8 points · 1 months ago

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

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comment on dual agonist — my 18-week log, condensed into one table in c/tirzepatide · 8 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 27 is not a fair reading.

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comment on [Discussion] can we stop arguing about import until somebody posts a number in c/customs · 3 points · 1 months ago

Disagree — that is the position in one country and this thread is about another. They are genuinely different.

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comment on dual agonist — my 18-week log, condensed into one table in c/tirzepatide · 14 points · 1 months ago

The distribution matters more than the mean.

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

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comment on [Discussion] we are measuring tirzepatide at the wrong time and calling it noise in c/tirzepatide · 21 points · 1 months ago

the reflux profile is genuinely gentler than people expect coming from sema

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comment on genuine question about purity that I am slightly embarrassed to ask in c/hplc · 3 points · 1 months ago

Resolution between two peaks depends on retention, selectivity and efficiency. A shallower gradient buys retention and usually resolution, at the cost of peak width and run time.

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comment on am I the only one who found Mounjaro harder than the injections in c/tirzepatide · 0 points · 1 months ago

Came off sema and onto tirz with a two-week gap.

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

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comment on [Below Spec] 94.1% with a 1.8% single impurity. is that the des-amido in c/labresults · 20 points · 1 months ago

Fourth lot from the same supplier in the log now and the band has been tight the whole way. That consistency is the actual finding.

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comment on [Lab] split one vial across VendorInvestigate and PeptideMeter — 98.6% and 98.4% in c/hplc · 121 points · 1 months ago

That is area percent, not mass percent. The trace cannot give you the second one.

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comment on anyone else notice tirzepatide kicking in around week 13 in c/tirzepatide · 33 points · 1 months ago

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

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

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comment on regain: what the trials say vs what this community says in c/maintenancephase · 25 points · 1 months ago

What does your weigh-in frequency look like at this point?

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comment on unpopular opinion: most of what gets said here about lowest effective dose is guesswork in c/maintenancephase · 7 points · 2 months ago

the trials that looked at withdrawal are unambiguous about what follows

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comment on [PSA] phase 2 is not what most of this community thinks it is in c/retatrutide · 148 points · 2 months ago

wait for phase 3 before you argue about rankings

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comment on [Question] how do you actually verify LC-MS in c/hplc · 2 points · 2 months ago

a blank injection between samples costs four minutes and settles most arguments

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comment on help me understand declared value, I have read the wiki twice in c/customs · 25 points · 3 months ago

Nothing on this board is legal advice. Where a notice carries a deadline or a consequence, that is a matter for somebody qualified in your own jurisdiction.

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comment on moderation is the most under-discussed thing on this board in c/meta · 1 points · 3 months ago

evidence rules are strict here on purpose

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comment on [Meta] proposal — a flair for Medutest posts in c/labresults · 92 points · 3 months ago

A series across separate lots estimates a process. Repeat tests on one lot estimate the measurement. Both are useful and they answer different questions.

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comment on how much of what we believe about dose escalation actually comes from glucagon threads in c/retatrutide · 94 points · 3 months ago

triple agonist — GLP-1, GIP and glucagon, and the glucagon arm is the new part

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comment on [Meta] the LC-MS rule is doing its job and people should stop complaining in c/hplc · 2 points · 3 months ago

Is that baseline drawn by the software or by hand?

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comment on [Meta] the LC-MS rule is doing its job and people should stop complaining in c/hplc · 475 points · 3 months ago

Correction: that is a tailing factor, not a plate count. Different diagnostics for different problems.

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comment on [Meta] the customs rule is doing its job and people should stop complaining in c/customs · 16 points · 3 months ago

ask the supplier what documentation accompanies the shipment

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comment on [Meta] proposal — a flair for integration posts in c/hplc · 38 points · 4 months ago

Carryover from a previous high-concentration injection looks exactly like a small impurity. The blank injection is four minutes and it removes the ambiguity entirely.

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comment on unpopular opinion: most of what gets said here about import is guesswork in c/customs · 10 points · 4 months ago

A hold, a request for information and a seizure are distinct administrative events. Each has its own process and deadlines, and the notice itself states which one you have.

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