Contributes reviews on supplier material. Based in Kaunas.
member · joined 12 Mar 2025
Overview — page 4 of 5
comment on batch vs related substances — genuinely asking which matters more in c/coa · 8 points · 1 year ago
area% is not mass%, and here is exactly why it matters
comment on why does nobody talk about related substances in c/coa · 1 points · 1 year ago
Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.
Disagree on that part. 93.7% and 99.3% on the same vial is normal.
comment on [Discussion] the purity advice in here is 8 years out of date in c/labresults · 3 points · 1 year ago
testing the vendor claim versus testing your actual vial are two different posts
comment on [Discussion] we are measuring bacteriostatic water at the wrong time and calling it noise in c/reconstitution · 1k points · 1 year ago
The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.
comment on genuine question about bacteriostatic water that I am slightly embarrassed to ask in c/reconstitution · 1 points · 1 year ago
Reconstituted at 2mL when I meant 14mL. Caught it because the units looked wrong. Write the concentration.
comment on genuine question about bacteriostatic water that I am slightly embarrassed to ask in c/reconstitution · 1 points · 1 year ago
swirl, do not shake, or you are courting oxidation
comment on genuine question about bacteriostatic water that I am slightly embarrassed to ask in c/reconstitution · 19 points · 1 year ago
The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.
Quick one. Canada here. reconstitution works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given…
comment on tried PBS for 8 weeks. here is what happened. in c/glp1aus · 6 points · 1 year ago
Slight fix: the number was 99.0, not 98.9.
Disagree on that part. 94.2% and 95.1% on the same vial is normal.
comment on Spain: batch, and what it actually costs here in c/coa · 88 points · 1 year ago
The chromatogram trace is where the real information lives. The summary number is just a headline.
comment on is it normal to get constipation at week 29 in c/reconstitution · 8 points · 1 year ago
Yeah, showing the arithmetic is the fastest way for someone to spot the error.
comment on help me understand units, I have read the wiki twice in c/reconstitution · 22 points · 1 year ago
more water means more units for the same dose, which means finer resolution
comment on the compounding question that gets asked weekly, answered properly in c/glp1aus · 57 points · 1 year ago
PBS listings change the cost completely
comment on area percent — my 20-week log, condensed into one table in c/coa · 56 points · 1 year ago
Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.
comment on small win: shortage stopped being a problem at week 71 in c/glp1aus · 17 points · 2 years ago
Strongly agree. AU and NZ differ.
comment on [Lab] split one vial across VendorInvestigate and PeptideMeter — 98.0% and 97.9% in c/coa · 164 points · 2 years ago
Disagree. What you are describing is consistent with certificate of analysis, not with what you concluded.
comment on [Discussion] purity is doing more work than we give it credit for in c/coa · 67 points · 2 years ago
axis labels included, always
comment on [Discussion] purity is doing more work than we give it credit for in c/coa · -24 points · 2 years ago
Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to QSC.
comment on [Discussion] purity is doing more work than we give it credit for in c/coa · 267 points · 2 years ago
The chromatogram trace is where the real information lives. The summary number is just a headline.
Long-ish post, sorry. tl;dr at the bottom. I have been tracking related substances against triglycerides for 11 weeks because I could not find anyone who had. The…
No trophies yet. Most accounts here never get one.
Certified reference materials for peptide identity and purity work.
sigmaaldrich.comSeveral compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.
Reference