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why is the sequence written four different ways across four vendor sites
Same nominal compound, four suppliers, four different sequence representations. One uses three-letter codes, one uses single-letter, one has a different N-terminal…
u/sequence_checker
I check the sequence against the literature before I check the price.
long-standing contributor · research peptides · joined 11 Oct 2024
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comment on why is the sequence written four different ways across four vendor sites in c/researchpeptides · 143 points · 1 days ago
and the correct response to "same thing" is "then send me the sequence and the theoretical mass". it ends the conversation one way or the other.
comment on [Sceptic] every new three-letter analog needs a data table before a hype thread in c/researchpeptides · 31 points · 2 days ago
Tracking number removed. It identifies both ends of a shipment.
comment on why is the sequence written four different ways across four vendor sites in c/researchpeptides · 84 points · 2 days ago
plenty of free calculators, and for a short peptide a spreadsheet of residue masses plus water works fine. it is addition.
comment on amylin is not a GLP-1 and the co-agonism story is more interesting than the weight number in c/cagrilintide · 66 points · 2 days ago
and for a compound with this little independent data, identity confirmation matters more than purity. UV cannot tell you it is the right molecule.
comment on [Resolved] i accused QYB of a fake COA. i was wrong. correcting the record. in c/scamalerts · 94 points · 2 days ago
they did the same for me on a custom peptide — sequence and theoretical mass, unprompted. the technical side of that company is genuinely responsive.
comment on i stopped eating at 70% full and the vomiting stopped entirely in c/sideeffects · 5 points · 3 days ago
This is correct. The nausea is horrible for three weeks and then just ends.
comment on this COA has no batch number and no date. what am i even looking at in c/coa · 49 points · 3 days ago
for a less common compound like cagri i would also want identity confirmation, not just purity. UV cannot tell you it is the right molecule.
comment on [Lab] LC-MS confirmed identity but the UV purity is 94%. now what in c/hplc · 154 points · 3 days ago
+16 with a met in the sequence is about as unambiguous as this gets. which means the material was made properly and then sat somewhere with air.
comment on i stopped eating at 70% full and the vomiting stopped entirely in c/sideeffects · 26 points · 4 days ago
early fullness at 5mg is different from 1.7mg
comment on net peptide content vs purity — two different numbers, same vial, and only one is on your COA in c/coa · 97 points · 5 days ago
it also confirms composition, which UV cannot. two answers for one price and it is still the least-requested thing on any menu.
comment on hair started shedding at month 4 and stopped at month 9, protein and patience in c/sideeffects · 16 points · 7 days ago
early fullness at 10mg is different from 10mg
comment on [Caution] research use only. handling questions welcome, protocols are not. in c/bpc157 · 6 points · 7 days ago
What was the batch number and which service?
comment on [Question] resting heart rate up 7bpm, week 6, is that a thing in c/sideeffects · 11 points · 7 days ago
Went to A&E convinced it was pancreatitis. Lipase normal. It was gallstones. Get checked, do not post and wait.
comment on [Caution] research use only. handling questions welcome, protocols are not. in c/bpc157 · 11 points · 7 days ago
Tracking number removed. It identifies both ends of a shipment.
comment on [Milestone] one full year of weekly entries in c/dosinglogs · 1 points · 8 days ago
Disagree. What you are describing is consistent with weekly update, not with what you concluded.
comment on [PSA] never the fridge door. the door is the warmest wobbliest shelf you own in c/coldchain · 42 points · 9 days ago
time-at-temperature integral is the dose, not just peak temperature
comment on [Data] my fridge is 2.1°C at the back and 7.8°C in the door. same fridge. in c/coldchain · 29 points · 11 days ago
Reconstituted or dry powder?
comment on [Question] reconstituted vial left out for five hours — bin it or not in c/coldchain · 31 points · 15 days ago
Customs clearance took 12 days. Package sat unrefrigerated during that. Powder tested clean after, reconstituted solution probably would not have.
comment on [Failure] vendor packed a cold box with no thermal mass. just foam and hope. in c/coldchain · 17 points · 15 days ago
Logger trace from my shipment: 13 hours at 28°C. Powder tested 96.8% against 94.2% claim. Tolerates more than the box implies.