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EW

u/ewan_marchand

Contributes reviews on supplier material. Based in Kaunas.

member · joined 14 May 2025

12,079post karma
11,852comment karma
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126comments

Overview — page 2 of 3

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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comment on reading HPLC threads from 2024 and half of it aged badly in c/hplc · 78 points · 4 months ago

a shoulder is not an impurity until you can resolve it

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comment on the test results thing finally clicked for me and I want to write it down in c/labresults · 5 points · 5 months ago

Correction: that is the claimed figure, and the measured one is the higher of the two in your own screenshot.

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comment on 15mg: the version I wish someone had shown me in week 1 in c/tirzepatide · 8 points · 5 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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comment on [Lab] WXT reta — PeptideMeter came back 97.1% against a claimed 97.0% in c/retatrutide · 35 points · 5 months ago

the escalation is where most of the reported trouble sits

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comment on [Meta] the moderation rule is doing its job and people should stop complaining in c/meta · 20 points · 6 months ago

Is this about a policy or about an individual removal?

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comment on [Meta] proposal — a flair for 15mg posts in c/tirzepatide · 101 points · 6 months ago

Careful with "everyone tolerates it better". The people it did not suit stop posting, which makes this board look calmer than the drug is.

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comment on [Discussion] jurisdiction is doing more work than we give it credit for in c/customs · 42 points · 6 months ago

Cosigning on paperwork. The boring documents are the ones that matter when a process starts.

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comment on unpopular opinion: most of what gets said here about ranking is guesswork in c/meta · -5 points · 6 months ago

The evidence standard on the vendor boards requires a document, a date or a named service behind any claim about a supplier. It is what makes those threads worth reading years later.

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comment on [Meta] the import rule is doing its job and people should stop complaining in c/customs · 42 points · 7 months ago

Same view — the rules where I am changed between one year and the next and nobody announced it.

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comment on help me understand glucagon, I have read the wiki twice in c/retatrutide · 72 points · 7 months ago

Correction: TRIUMPH is the phase 3 programme. The number you are quoting is from the phase 2 readout, which is a different trial.

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comment on [Question] gradient — what am I missing here in c/hplc · 38 points · 7 months ago

System suitability — repeat injections, tailing factor, plate count, RSD on area — is what tells you the instrument was fit for the measurement that day. Without it, the purity figure is unanchored.

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comment on [Lab] split one vial across VendorInvestigate and PeptideMeter — 99.1% and 96.8% in c/labresults · 70 points · 7 months ago

Chain of custody is why member-funded testing is worth more than a supplied certificate: the vial tested is the vial that arrived at a member’s door.

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comment on [Question] retatrutide — what am I missing here in c/retatrutide · 1 points · 7 months ago

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

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comment on tirzepatide — 9 things I got wrong before I got it right in c/tirzepatide · 21 points · 7 months ago

Appetite effect for me is flat across seven days. On sema it was a wave. Same person, different molecule.

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comment on reading retatrutide threads from 2024 and half of it aged badly in c/retatrutide · 176 points · 8 months ago

Glucagon receptor agonism is associated with increased energy expenditure and with hepatic effects. That is a mechanistic story with strong preclinical support and limited phase 2 human data.

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comment on gradient is the most under-discussed thing on this board in c/hplc · 5 points · 8 months ago

Same view — reporting the gradient is what makes a result checkable rather than merely stated.

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comment on [Discussion] we are measuring SURPASS at the wrong time and calling it noise in c/tirzepatide · -6 points · 8 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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comment on [Question] is 99.3% actually fine or am I being sold a rounding error in c/tirzepatide · 28 points · 9 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.

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

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comment on someone explain Zepbound to me like I have not read a paper in years in c/tirzepatide · 237 points · 9 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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comment on [Question] LC-MS — what am I missing here in c/hplc · 2 points · 9 months ago

This. A shoulder that does not baseline-resolve is a question, not a quantity.

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comment on [Meta] proposal — a flair for Mounjaro posts in c/tirzepatide · 427 points · 9 months ago

pens and vials are the same molecule, the price is the difference

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comment on [Discussion] the chromatogram advice in here is 2 years out of date in c/hplc · 1 points · 10 months ago

Same view — reporting the gradient is what makes a result checkable rather than merely stated.

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comment on how much of what we believe about tirzepatide actually comes from 15mg threads in c/tirzepatide · 105 points · 10 months ago

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

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comment on how much of what we believe about HPLC actually comes from integration threads in c/hplc · 37 points · 10 months ago

area percent is relative to what the detector saw and nothing else

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comment on [Results] 74 weeks, 23kg, and GIP was the hard part in c/tirzepatide · 438 points · 10 months ago

Appetite effect for me is flat across seven days. On sema it was a wave. Same person, different molecule.

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comment on [Results] 74 weeks, 23kg, and GIP was the hard part in c/tirzepatide · 72 points · 10 months ago

Which week did the appetite change actually land for you?

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comment on [PSA] Janoshik is not what most of this community thinks it is in c/labresults · 48 points · 10 months ago

Retitled — the original stated a discrepancy the numbers do not show.

Disagreeing with this line: that gap is ordinary variance, not a contradiction between the lab and the certificate.

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comment on [Meta] proposal — a flair for LC-MS posts in c/hplc · 1 points · 10 months ago

This. A shoulder that does not baseline-resolve is a question, not a quantity.

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comment on [Meta] proposal — a flair for LC-MS posts in c/hplc · 119 points · 10 months ago

UV response is not uniform across species. At 214nm you are looking at the peptide bond, which is why it is the working wavelength for this class; at 280nm you only see tryptophan, tyrosine and phenylalanine.

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comment on [Discussion] can we stop arguing about long term until somebody posts a number in c/maintenancephase · 4 points · 11 months ago

regain after stopping is the expected outcome, not a personal failure

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comment on [Lab] HJ cagri — Janoshik came back 97.5% against a claimed 97.0% in c/hplc · 662 points · 11 months ago

Mass spectrometry answers identity. UV purity answers relative quantity under the run conditions. A document with one and not the other is answering half the question, and the half it answers should be stated.

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comment on the GIP question that gets asked weekly, answered properly in c/tirzepatide · 70 points · 11 months ago

sulphur burps are the signature complaint and they are not dangerous

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comment on how much of what we believe about HPLC actually comes from LC-MS threads in c/hplc · -15 points · 11 months 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 is it normal to get early fullness at week 90 in c/maintenancephase · 1 points · 12 months ago

stretching the interval is not the same as reducing the dose

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comment on [Question] integration — what am I missing here in c/hplc · 27 points · 1 year ago

two labs, two gradients, two honest answers

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comment on moderation — 21 things I got wrong before I got it right in c/meta · 11 points · 1 year ago

Not convinced by the proposal as worded. It would remove the specific thing that makes the vendor board usable.

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comment on moderation — 21 things I got wrong before I got it right in c/meta · 47 points · 1 year ago

Moderation of individual cases happens in modmail rather than in threads, because a public discussion of one person’s removal is worse for that person than a private one.

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