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u/dario_vermeulen

Contributes reviews on supplier material. Based in Monterrey.

member · joined 16 Jul 2025

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Comments — page 2 of 2

comment on SURMOUNT: what the trials say vs what this community says in c/tirzepatide · 14 points · 11 months ago

Right. And the sema-to-tirz "conversion" people post is invented. There is no published equivalence.

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comment on [Question] TB-500 — what am I missing here in c/researchpeptides · 38 points · 11 months ago

Research-use-only material is not approved for human use. In this catalogue that covers essentially everything, which is why the board discusses material and analytics rather than outcomes.

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comment on [Vendor] HJ vs QYB on the same compound, same month — both cleared 97.0% in c/coa · 0 points · 1 year ago

Spent four months confusing area% and mass% in every post I made here.

Agreed, and the practical version is: ask for the itemised table. If it exists, you get it.

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comment on how much of what we believe about appetite return actually comes from regain threads in c/tapering · 24 points · 1 year ago

a fortnight of nothing is not evidence that you are fine

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comment on how much of what we believe about purity actually comes from related substances threads in c/coa · 375 points · 1 year ago

Disagree that a lower number is automatically worse. A conservative claim that survives testing is worth more than an optimistic one that does not.

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comment on someone explain discontinuation to me like I have not read a paper in years in c/tapering · 1 points · 1 year ago

Yes — the withdrawal literature is consistent and it is a pharmacological finding, not a moral one.

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comment on [Meta] proposal — a flair for SURMOUNT posts in c/tirzepatide · 0 points · 1 year 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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comment on [Question] is 99.1% actually fine or am I being sold a rounding error in c/coa · 326 points · 1 year ago

axis labels included, always

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comment on [Discussion] the purity advice in here is 3 years out of date in c/coa · 30 points · 1 year ago

Not quite. Two labs with different gradients can resolve a close-eluting impurity differently and both be reporting honestly.

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comment on unpopular opinion: most of what gets said here about area percent is guesswork in c/coa · 21 points · 1 year ago

LC-MS gives you identity; UV purity gives you a relative quantity. A document with the first and not the second, or the reverse, is answering half the question.

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

Agreed, and the trial number is a mean of a very wide distribution — the tails are enormous and nobody posts from the middle.

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comment on [Question] SURMOUNT — what am I missing here in c/tirzepatide · -37 points · 1 year ago

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

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comment on [PSA] GIP is not what most of this community thinks it is in c/tirzepatide · 19 points · 1 year 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 [Question] how do you actually verify special authorization in c/glp1canada · 217 points · 1 year ago

the pharmacist is often the fastest route to a definite answer

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comment on unpopular opinion: most of what gets said here about certificate of analysis is guesswork in c/coa · 1 points · 1 year ago

That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.

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comment on [Discussion] purity is doing more work than we give it credit for in c/coa · 51 points · 1 year ago

Are the related substances itemised or is it a single total?

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comment on how much of what we believe about dual agonist actually comes from GIP threads in c/tirzepatide · 70 points · 1 year ago

What step are you on and how long have you been there?

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comment on [Discussion] the related substances advice in here is 2 years out of date in c/coa · 0 points · 1 year ago

LC-MS gives you identity; UV purity gives you a relative quantity. A document with the first and not the second, or the reverse, is answering half the question.

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comment on [Vendor] JEEP vs WXT on the same compound, same month — both cleared 98.5% in c/coa · 18 points · 1 year ago

Did you get the chromatogram or only the summary line?

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comment on [Vendor] JEEP vs WXT on the same compound, same month — both cleared 98.5% in c/coa · 41 points · 1 year ago

Small fix — 214nm, not 280nm. It matters here because the impurity you are asking about barely absorbs at the longer wavelength.

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comment on help me understand 15mg, I have read the wiki twice in c/tirzepatide · 8 points · 1 year ago

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

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comment on unpopular opinion: most of what gets said here about discontinuation is guesswork in c/tapering · 294 points · 1 year ago

There is very little published guidance on stopping specifically, which is exactly why board consensus here should carry less weight than usual and a clinician conversation should carry more.

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comment on [Question] special authorization — what am I missing here in c/glp1canada · 30 points · 1 year ago

Have you asked the pharmacist to check?

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comment on help me understand area percent, I have read the wiki twice in c/coa · 208 points · 1 year ago

Started keeping a folder of every certificate I have been sent. The ones that itemise impurities are a small group and they are mostly the same suppliers.

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comment on [Discussion] discontinuation is doing more work than we give it credit for in c/tapering · 9 points · 1 year ago

A written baseline — dose, date, weight, waist, and how appetite feels — taken before any change is what makes the following months interpretable rather than a series of impressions.

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comment on my ApoB moved and I cannot work out whether SURPASS is why in c/tirzepatide · 462 points · 2 years ago

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

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comment on [Meta] the SURPASS rule is doing its job and people should stop complaining in c/tirzepatide · 44 points · 2 years ago

Disagree with the conversion table. There is no validated equivalence between the two molecules and posting one as though there is does real damage.

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comment on purity is the most under-discussed thing on this board in c/coa · 230 points · 2 years ago

batch number, date of analysis, method, individual impurities — that is the minimum set

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comment on [Question] Denmark — has anyone got a straight answer on province in c/glp1canada · 79 points · 2 years ago

I would not read one pharmacy’s cash price as the going rate. The spread is real.

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comment on [Question] Denmark — has anyone got a straight answer on province in c/glp1canada · -38 points · 2 years ago

formulary decisions are provincial, so the province is the first fact

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comment on [Meta] the tirzepatide rule is doing its job and people should stop complaining in c/tirzepatide · 54 points · 2 years ago

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

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comment on [Meta] proposal — a flair for batch posts in c/coa · 0 points · 2 years ago

Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.

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comment on unpopular opinion: most of what gets said here about water content is guesswork in c/coa · 71 points · 2 years ago

Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.

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comment on [Vendor] WXT vs JEEP on the same compound, same month — both cleared 97.0% in c/coa · 1.9k points · 2 years ago

Not quite. Two labs with different gradients can resolve a close-eluting impurity differently and both be reporting honestly.

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comment on [Question] COA — what am I missing here in c/coa · 250 points · 2 years ago

Right, and net peptide content is where the counterion and the water go. Both numbers can be honest and very different.

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comment on purity — 3 things I got wrong before I got it right in c/coa · 152 points · 2 years ago

Yes — and the reason to ask for the whole page is that the interesting parts are the ones people crop out to fit a screenshot.

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comment on [Discussion] the area percent advice in here is 2 years out of date in c/coa · 33 points · 2 years ago

identity and quantity are two questions and most documents answer one

reflux_report has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.

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