[Meta] proposal — a flair for certificate of analysis posts
I have had 10 orders now and I keep a table, so here is the honest summary rather than a vibe.
Material has been consistent. Communication has not. Shipping has varied by about 32 days on nominally the same lane, which matters more in summer than in February.
The independent number came back 99.0% against a claimed 98.0%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.
Batch number is in the comments. Ask if you want the method.
best — the order this archive was captured in
Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.
Did they give you the chromatogram or just the summary line?
Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.
Strongly agree. Mass% and area% are answering different questions on the same document.
This is the correct framing. The COA structure matters as much as the number.
Retitled to remove editorialising. Put the evidence in the body.
Dead space in the needle hub holds a small but non-trivial volume. On low-volume draws that can be several units.
the related substances line is where the story is
No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.
post the whole document, not the headline number
Are you looking at area% or net peptide content? Different numbers.
redact your own name, not the vendor's batch details
redact your own name, not the vendor's batch details
Disagree on that part. 98.7% and 98.9% on the same vial is normal.
Water content on the document? That affects your concentration math.
Strongly agree. Mass% and area% are answering different questions on the same document.
Tested the GLB raw material and a reseller vial side-by-side. Same purity claim, different impurity profiles. Handling matters.
Four months on the site and I was confusing area% and mass% in every post I made. One explainer thread and it clicked.
chromatogram or it did not happen
That is net peptide content, not purity. Different number, different meaning.
the related substances line is where the story is
the Medutest number or it did not happen
Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.
no "is this good?" without saying what the compound and claimed purity are
Batch number and date of analysis? Both are load-bearing.
PDF metadata is checkable in fifteen seconds
PDF metadata is checkable in fifteen seconds
Adding to this: area percent is doing more work than the comment implies.
Water content on the document? That affects your concentration math.
the counterion is part of the mass you paid for
- 1Retitled to remove editorialising. Put the evidence in the body.12 comments in this branch · started by u/certified_reference
- 2the Medutest number or it did not happen8 comments in this branch · started by u/ismael_eriksen