Genuine question, and the title is the question: can we stop arguing about COA until somebody posts a number. Spent four months confusing area% and mass% in every post…
u/marisol_frisk
Contributes reviews on supplier material. Based in Wrocław.
member · joined 14 May 2025
Overview — page 2 of 3
comment on why does nobody talk about dual agonist in c/survodutide · 9 points · 2 months ago
It is a dual agonist at the GLP-1 and glucagon receptors. The glucagon arm is associated with increased energy expenditure and with effects on hepatic fat, which is why the development programme is oriented towards liver disease.
comment on [Question] certificate of analysis — what am I missing here in c/coa · 164 points · 3 months ago
Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient. It is a relative measure of what the detector saw, not a mass fraction of the vial.
comment on stalled for 14 weeks at 12.5mg and I refuse to panic this time in c/darkspot · 7 points · 3 months ago
Right, and stopping for money reasons is not a failure of anything. It is a budget.
comment on anyone else notice failure kicking in around week 21 in c/darkspot · 49 points · 3 months ago
Contemporaneous notes matter most in exactly the situations where people are least inclined to write them. Memory reorganises a bad fortnight into a tidier story with a clearer villain.
comment on [Discussion] can we stop arguing about COA until somebody posts a number in c/coa · 85 points · 4 months ago
Does the lot on the vial match the lot on the page?
comment on [Discussion] can we stop arguing about COA until somebody posts a number in c/coa · 519 points · 4 months ago
Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label weight. All four numbers honest, and I had to read it twice.
comment on the MASH thing finally clicked for me and I want to write it down in c/survodutide · 52 points · 4 months ago
Imaging-derived liver fat fraction is a surrogate. It correlates with histology imperfectly, and a trial reporting one is not reporting the other.
comment on [PSA] purity is not what most of this community thinks it is in c/coa · 6 points · 4 months ago
Correction: that is net peptide content, not purity. Different number, different meaning, and the document says so if you read the row label.
comment on [Question] how do you actually verify reimbursement in c/glp1eu · 11 points · 4 months ago
Marketing authorisation is granted centrally for these products; reimbursement, pricing and prescribing criteria are national competences. Those are decided by different bodies with different processes.
comment on [Question] how do you actually verify moderation in c/meta · 50 points · 4 months ago
Agreed. Publishing the ranking formula is the difference between a feed and a black box, and it costs nothing to do.
comment on three years of dead space threads, summarised so you do not have to read them in c/reconstitution · 141 points · 4 months ago
Same. I got this wrong once, caught it because the units looked absurd, and have written on every vial since.
comment on reading batch threads from 2024 and half of it aged badly in c/coa · 9 points · 4 months ago
identity and quantity are two questions and most documents answer one
comment on unpopular opinion: most of what gets said here about cloned site is guesswork in c/scamalerts · 1 points · 5 months ago
The directory deliberately separates "we have nothing on this name" from "this went badly". Collapsing the two is how boards like this generate false certainty.
comment on [Question] how do you actually verify purity in c/hplc · 48 points · 5 months ago
Is that baseline drawn by the software or by hand?
comment on [Discussion] units are doing more work than we give it credit for in c/reconstitution · 16 points · 5 months ago
20mg into 1mL is 20mg/mL, and 5mg of that is 25 units
comment on three years of survodutide threads, summarised so you do not have to read them in c/survodutide · 9 points · 5 months ago
the weight numbers are secondary to what this is being developed for
comment on [Discussion] regret is doing more work than we give it credit for in c/darkspot · 114 points · 5 months ago
the regret is usually about pace, not about the decision
comment on unpopular opinion: most of what gets said here about COA is guesswork in c/coa · 20 points · 5 months ago
Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.
comment on [Lab] 24th independent test on CPC — 97.8% on a claimed 97.0%, and the trend is the interesting part in c/researchpeptides · 13 points · 5 months ago
Net peptide content on the certificate?
comment on three years of rules threads, summarised so you do not have to read them in c/meta · 114 points · 5 months ago
A rule-change proposal needs replacement wording because that is what can be evaluated. Without it there is nothing to compare against the current text.
comment on help me understand PDF metadata, I have read the wiki twice in c/scamalerts · 6 points · 5 months ago
What is the exact domain, character for character?
comment on help me understand PDF metadata, I have read the wiki twice in c/scamalerts · 35 points · 5 months ago
Is there any independent testing on file for this name anywhere?
comment on help me understand PDF metadata, I have read the wiki twice in c/scamalerts · 13 points · 5 months ago
What did the storefront say the lead time was?
help me understand PDF metadata, I have read the wiki twice — that is what I am asking, and I have already read the wiki twice. Lost money once, years ago, to a shop…
comment on [Lab] 10th independent test on ERP — 97.2% on a claimed 97.0%, and the trend is the interesting part in c/coa · 54 points · 6 months ago
Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual solvent are accounted for. A 99% pure acetate salt can still be about 85% peptide by mass.
comment on [Lab] 10th independent test on ERP — 97.2% on a claimed 97.0%, and the trend is the interesting part in c/coa · 16 points · 6 months ago
Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.
comment on the UK: reimbursement, and what it actually costs here in c/glp1eu · 31 points · 6 months ago
Same. Naming the country in the first line would fix most of the bad advice on this board.
comment on mg/mL — 16 things I got wrong before I got it right in c/reconstitution · 5 points · 6 months ago
Adding more water does not change how much peptide is in the vial. It changes the concentration, which changes the volume you draw for the same amount. That is the entire relationship.
comment on unpopular opinion: most of what gets said here about MASH is guesswork in c/survodutide · 12 points · 6 months ago
Independent purity results for this compound are very sparse across the whole site, which means any impression about consistency is built on almost nothing.
comment on reading identity threads from 2024 and half of it aged badly in c/researchpeptides · 19 points · 6 months ago
Same. Net peptide content is where the difference between the label and the vial actually shows up.
comment on reading identity threads from 2024 and half of it aged badly in c/researchpeptides · 27 points · 6 months ago
Confirmed the lead time in writing before ordering a made-to-order line. It was longer than the site suggested and entirely reasonable once explained.
comment on help me understand LC-MS, I have read the wiki twice in c/hplc · 269 points · 6 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.
comment on [Meta] the gradient rule is doing its job and people should stop complaining in c/hplc · 1 points · 6 months ago
system suitability before you believe any number on the run
comment on [Meta] the gradient rule is doing its job and people should stop complaining in c/hplc · 0 points · 6 months ago
a shoulder is not an impurity until you can resolve it
comment on [Meta] proposal — a flair for mg/mL posts in c/reconstitution · 37 points · 7 months ago
Cosigning the round-number approach. Reconstituting to something awkward is how you end up drawing 27.5 units at six in the morning.
comment on [Discussion] handling is doing more work than we give it credit for in c/researchpeptides · 1 points · 7 months ago
the less-tested the compound, the more the identity test matters
Something I keep coming back to: handling is doing more work than we give it credit for. Confirmed the lead time in writing before ordering a made-to-order line. It was…
comment on [PSA] stopped is not what most of this community thinks it is in c/darkspot · 28 points · 7 months ago
Are you being harder on yourself than you would be on somebody else posting this?
comment on reading related substances threads from 2024 and half of it aged badly in c/coa · 1 points · 7 months ago
Are the related substances itemised or is it a single total?