c/coa · created 18 Aug 2023
Certificates of analysis, decoded. Post the whole document, not the headline number.
I have typed some version of this comment about four hundred times so it is going in one place. Area% is the main peak as a fraction of total UV absorbance across all…
CPC semaglutide 10mg. COA says 96.8%, method line says "HPLC", batch and date both present. Nothing cropped, whole page. Everyone in here talks about 98 and 99 like…
Short answer, for anyone who finds this from a search: no. Longer version. A COA from an actual laboratory is exported from instrument software or from a LIMS. The PDF…
FGP cagrilintide. The document has a compound name, a purity figure, a logo, and a signature image. No batch number. No date of analysis. No method beyond the word…
Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.
Reference standardsRan these on the same day, same method, same column, injections back to back. One is GL Biochem raw material, one is a reseller vial of nominally the same compound and…
Following on from the area% thread, because the same confusion turns up in a second form. People read a 10mg vial at 99% purity and conclude they have 9.9mg of peptide.…
Confession thread, sort of. I went from 7.5mg to 2.4mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 6 weeks…
Trying to settle this properly because the thread from last year went in circles. The claim: COA matters. The counter-claim: it is measurement error. Both sides have…
Been lurking in c/survodutide for about 14 months and finally have something worth posting. Short version: week 15, 1.7mg, and COA is the bit I still cannot get a…
Right, the certificate of analysis question again, but with numbers this time. I have 12 data points over 36 weeks. The pattern is consistent enough that I do not think…
Posting this because I searched for it and got nothing useful. Setup: 0.5mg, week 81, injection-site soreness present but not ruining anything. I changed exactly one…
purity. That is the whole post, but I will justify it. Everything else people worry about in c/sideeffects is downstream of it. Titration speed, muscle cramps, the…
Right, the related substances question again, but with numbers this time. I have 19 data points over 10 weeks. The pattern is consistent enough that I do not think it…
Genuinely asking, not being difficult. Everyone in c/scamalerts repeats that batch is important. I believe it, but I have never seen anyone show why, and when I search…
Week 11 update. 22kg down from the start, muscle cramps basically gone since about week 51. Things that worked: consistency, protein at breakfast, walking more than I…
Send the vial, get the number. Third-party purity and identity testing, results published to you regardless of what they say.
Test a vialSponsoredEst. 1998. ISO 9001 and cGMP, 1,500+ staff, 200+ patents. There is a fair chance the vial you are about to send for testing started here. Batch-specific COA as standard.
glbiochem.netConfession thread, sort of. I went from 1.0mg to 15mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 14 weeks…
Posting this because I searched for it and got nothing useful. Setup: 10mg, week 38, sulphur burps present but not ruining anything. I changed exactly one variable —…
Genuinely asking, not being difficult. Everyone in c/scamalerts repeats that area percent is important. I believe it, but I have never seen anyone show why, and when I…
Right, the certificate of analysis question again, but with numbers this time. I have 4 data points over 16 weeks. The pattern is consistent enough that I do not think…
Trying to settle this properly because the thread from last year went in circles. The claim: certificate of analysis matters. The counter-claim: it is measurement…
Week 71 update. 37kg down from the start, early fullness basically gone since about week 16. Things that worked: consistency, protein at breakfast, walking more than I…
Genuinely asking, not being difficult. Everyone in c/progresspics repeats that water content is important. I believe it, but I have never seen anyone show why, and when…
Right, the COA question again, but with numbers this time. I have 8 data points over 20 weeks. The pattern is consistent enough that I do not think it is chance, and…
Trying to settle this properly because the thread from last year went in circles. The claim: purity matters. The counter-claim: it is measurement error. Both sides have…
Quick one. Canada here. related substances works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently…
How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.
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