COA

Slightly embarrassed to be asking this, but: certificate of analysis — what am I missing here. Spent four months confusing area% and mass% in every post I made here.…

6th independent test on HJ — 99.1% on a claimed 99.0%, and the trend is the interesting part. One vial, one service, one member paying, which is the only kind of result…

COA — 5 things I got wrong before I got it right — a position I have arrived at slowly and would like tested. LC-MS gives you identity; UV purity gives you a relative…

The title is the argument: related substances — 9 things I got wrong before I got it right. Here is the rest of it. The PDF creation date being later than the analysis…

Genuine question, and the title is the question: how much of what we believe about COA actually comes from area percent threads. My first certificate had a compound…

batch is not what most of this community thinks it is. It comes up every few weeks and the answer has not changed. The document I was worried about turned out to be a…

Posting this as a discussion rather than a claim: unpopular opinion: most of what gets said here about purity is guesswork. LC-MS gives you identity; UV purity gives…

Posting this because the title is the whole finding — JEEP vs WXT on the same compound, same month — both cleared 98.5% — and a number without its method is a rumour.…

Short public-service post: the four things a COA must have or it is decorative. Asked CPC for the batch-specific certificate and had the full document — batch, date,…

1,100-odd COAs in my folder structure. Sorted by vendor, then compound, then batch. I do this instead of having hobbies. Here is a pattern I did not expect: water…

we are measuring area percent at the wrong time and calling it noise. Not a hot take, just something I have not seen said plainly here. Net peptide content is the…

identical chromatogram on two different compounds from the same vendor. Order-by-order, with dates, because vibes are not data. My first certificate had a compound…

identity and quantity are two questions and most COAs answer one. It is the sort of thing everyone half-believes and nobody writes down. Asked for the storage condition…

The claim in the title is exactly the claim I am making: split one vial across VendorInvestigate and PeptideMeter — 97.2% and 98.4%. Nothing implied beyond it. Pulling…

the batch question that gets asked weekly, answered properly. I have gone back and forth on this for months. Asked for the storage condition behind the stability…

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.…

Trying to get a straight answer on this: can we stop arguing about water content until somebody posts a number. The document I was worried about turned out to be a…

batch — what am I missing here. If this has been answered properly somewhere, link me and I will delete. Ask what the stability statement was written against —…

Short report. accused a vendor of a fake COA. i was wrong. correcting the record. Dates and lane below. Group buys concentrate custody, payment and communication in one…

The title is the argument: certificate of analysis — 18 things I got wrong before I got it right. Here is the rest of it. Area percent is the peak area of your compound…

Trying to get a straight answer on this: does water content actually matter or is it forum lore at this point. LC-MS gives you identity; UV purity gives you a relative…

the COA thing finally clicked for me and I want to write it down. Making the case below, and I expect to lose some of it in the comments. My first certificate had a…

Posting this as a discussion rather than a claim: net peptide content vs purity — two different numbers, same vial. Why the same vial can honestly produce three…

recycled COA PDF — same producer string, same timestamp, three vendors. Multiple orders, one buyer, which makes this a series and not a survey. Lost money once, years…

18th independent test on HJ — 99.2% on a claimed 99.0%, and the trend is the interesting part. One vial, one service, one member paying, which is the only kind of…