COA

Right: split one vial across Janoshik and Medutest — 98.1% and 97.6%. I paid for this one myself, nobody sent me anything, and the receipts are in the comments. The…

how much of what we believe about related substances actually comes from certificate of analysis threads. Searched first, found three threads that contradict each…

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…

certificate of analysis is not what most of this community thinks it is. Two minutes of reading now saves an argument later. My first certificate had a compound name, a…

three years of purity threads, summarised so you do not have to read them, and I am aware this is a minority view on this board. The four things a certificate must…

Posting this because the title is the whole finding — full document, nothing cropped, tell me what i am missing — and a number without its method is a rumour. How to…

someone explain fake COA to me like I have not read a paper in years — that is what I am asking, and I have already read the wiki twice. The group-buy structure,…

we are measuring COA at the wrong time and calling it noise. I have gone back and forth on this for months. UV at 214nm sees the peptide bond and picks up almost…

three years of COA threads, summarised so you do not have to read them. It is the sort of thing everyone half-believes and nobody writes down. Asked GL Biochem for the…

which fields turn a COA from a specification into a result. Change my mind, genuinely — I have no stake in being right about this. Water content 3.8%, acetate 6.2%,…

water content is on the COA and everyone skips it — a position I have arrived at slowly and would like tested. Why the same vial can honestly produce three different…

PDF producer string says the file was made in a browser. is that normal — a position I have arrived at slowly and would like tested. LC-MS gives you identity; UV purity…

Asking properly rather than in a comment on somebody else’s thread: fake COA — what am I missing here. The directory deliberately separates "we have nothing on this…

Filing this under things worth writing down: 61.2% on a vial that shipped with a 99% COA. Figures up front so nobody has to dig: 61.2% and 99%. Date of analysis anchors…

Trying to get a straight answer on this: what is a COA and how do i know if it is real. How to ask a question here so that you get a useful answer. Say what week you…

Title says it — is 96.8% area% actually fine or am i being sold a rounding error — so here is the boring supporting detail that makes it worth anything. 96.8%. Those…

Posting this as a discussion rather than a claim: acetate counterion is why your 10mg vial has 8.7mg of peptide. Numbers, in the order they matter: 10mg and 8.7mg. UV…

the same signature image on COAs from three vendors. Multiple orders, one buyer, which makes this a series and not a survey. Ask what the stability statement was…

area percent is not what most of this community thinks it is. If you already knew this, the post is not for you and you can scroll on. Net peptide content is the…

Short version of the title, which is already short: is 98.3% actually fine or am I being sold a rounding error. Longer version underneath. Since the title puts numbers…

Posting this because the title is the whole finding — QSC BPC — Janoshik came back 98.7% against a claimed 98.5% — and a number without its method is a rumour. 98.7%…

a vendor-supplied COA is a marketing document until someone else agrees with it. It comes up every few weeks and the answer has not changed. Inter-lab variance on this…

the COA advice in here is 2 years out of date, and I am aware this is a minority view on this board. 2 years — those are the numbers, and they are the ones I am willing…