3.5k
what would you tell week-1 you about HPLC
Week 47 update. 43kg down from the start, reflux basically gone since about week 87. Things that worked: consistency, protein at breakfast, walking more than I want to.…
purity
Every GLP Research Hub submission tagged to purity, ranked by score. Discussed in 3 communities.
Communities covering this
3.4k
test results — 5 things I got wrong before I got it right
Something I noticed reading old threads that I have not seen said out loud. The advice on Medutest in this community changed substantially around the start of last…
3.4k
batch: the version I wish someone had shown me in week 1
Confession thread, sort of. I went from 1.7mg to 0.25mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 9 weeks…
3.4k
[PSA] COA is not what most of this community thinks it is
Quick one. Canada here. batch works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice…
Sigma-Aldrich — certified reference materials
Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.
Reference standards3.4k
nobody warned me about reflux and I would have liked the warning
Posting this because I searched for it and got nothing useful. Setup: 0.5mg, week 95, injection-site soreness present but not ruining anything. I changed exactly one…
3.4k
[Results] 87 weeks, 36kg, and purity was the hard part
Long-ish post, sorry. tl;dr at the bottom. I have been tracking LC-MS against eGFR for 29 weeks because I could not find anyone who had. The correlation is weaker than…
3.4k
the water content question that gets asked weekly, answered properly
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…
3.3k
chromatogram: the version I wish someone had shown me in week 1
Right, the purity question again, but with numbers this time. I have 12 data points over 32 weeks. The pattern is consistent enough that I do not think it is chance,…
3.3k
stalled for 22 weeks at 1.0mg and I refuse to panic this time
water content. That is the whole post, but I will justify it. Everything else people worry about in c/darkspot is downstream of it. Titration speed, muscle cramps, the…
3.3k
tried PeptideMeter for 23 weeks. here is what happened.
Quick one. Canada here. Medutest works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice…
3.2k
[Results] 42 weeks, 21kg, and purity was the hard part
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…
3.2k
switched from 1.0mg to 0.5mg and the constipation got better, not worse
Posting this because I searched for it and got nothing useful. Setup: 1.7mg, week 54, injection-site soreness present but not ruining anything. I changed exactly one…
3.2k
does purity actually matter or is it forum lore at this point
chromatogram. That is the whole post, but I will justify it. Everything else people worry about in c/dosinglogs is downstream of it. Titration speed, muscle cramps, the…
3.2k
water content — 5 things I got wrong before I got it right
Confession thread, sort of. I went from 0.25mg to 10mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 13 weeks…
3.2k
nobody warned me about nausea and I would have liked the warning
Quick one. Canada here. COA works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that…
Janoshik Analytical — independent HPLC & mass spec
Send the vial, get the number. Third-party purity and identity testing, results published to you regardless of what they say.
Test a vialSponsoredGL Biochem (Shanghai) Ltd. — the synthesis house
Est. 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.net3.2k
genuine question about gradient that I am slightly embarrassed to ask
Been lurking in c/t2dglp1 for about 13 months and finally have something worth posting. Short version: week 34, 15mg, and gradient is the bit I still cannot get a…
3.1k
[Discussion] the purity advice in here is 9 years out of date
Posting this because I searched for it and got nothing useful. Setup: 1.7mg, week 52, sulphur burps present but not ruining anything. I changed exactly one variable —…
3.1k
stalled for 17 weeks at 7.5mg and I refuse to panic this time
area percent. That is the whole post, but I will justify it. Everything else people worry about in c/darkspot is downstream of it. Titration speed, reflux, the endless…
3.1k
switched from 12.5mg to 0.5mg and the muscle cramps got better, not worse
Long-ish post, sorry. tl;dr at the bottom. I have been tracking purity against ApoB for 25 weeks because I could not find anyone who had. The correlation is weaker than…
3.1k
the purity thing finally clicked for me and I want to write it down
Week 37 update. 13kg down from the start, muscle cramps basically gone since about week 89. Things that worked: consistency, protein at breakfast, walking more than I…
3k
[Discussion] can we stop arguing about area percent until somebody posts a number
Long-ish post, sorry. tl;dr at the bottom. I have been tracking related substances against eGFR for 29 weeks because I could not find anyone who had. The correlation is…
3k
[Question] New Zealand — has anyone got a straight answer on LC-MS
method development. That is the whole post, but I will justify it. Everything else people worry about in c/dosinglogs is downstream of it. Titration speed, early…
3k
small win: chromatogram stopped being a problem at week 95
Right, the HPLC question again, but with numbers this time. I have 15 data points over 40 weeks. The pattern is consistent enough that I do not think it is chance, and…
3k
[Meta] the purity rule is doing its job and people should stop complaining
Genuinely asking, not being difficult. Everyone in c/semaglutide repeats that below spec is important. I believe it, but I have never seen anyone show why, and when I…
3k
[Question] Australia — has anyone got a straight answer on integration
Genuinely asking, not being difficult. Everyone in c/glp1uk repeats that method development is important. I believe it, but I have never seen anyone show why, and when…