Has anyone dealt with are all coas created equal? mine looks different from others i see?

BiostatsBrad said:

Third-party testing services for certificates of analysis besides Janoshik: Janoshik: Gold standard for peptide community, ~$138, 10-14 day turnaround…

My HPLC chromatogram analysis for certificates of analysis — I sent my batch to Janoshik and here's what the results showed:

Main peak retention time: 16.3 minutes (consistent with semaglutide reference standard)
Peak purity: 99.2%
Related substances: 0.8% (single impurity at 10.1 minutes — likely a synthesis intermediate)
Mass spec: m/z 4113.5 (matches expected molecular weight)

This is a clean result. The mass spec confirmation is particularly important — it proves the molecule is actually semaglutide and not a substitution.

BiostatsBrad said:

Third-party testing services for certificates of analysis besides Janoshik: Janoshik: Gold standard for peptide community, ~$138, 10-14 day turnaround…

Agreed, and the size of the effect matters as much as its existence. Something real and small gets treated here as though it were real and decisive.

BiostatsBrad said:

Third-party testing services for certificates of analysis besides Janoshik: Janoshik: Gold standard for peptide community, ~$138, 10-14 day turnaround…

Saving this. It is the first explanation that did not require me to already understand it. Taking it to my next appointment.

From the other side of the consultation, briefly. It helps to say which part of this you are uncertain about. A precise question gets a precise answer; a general one gets everybody’s favourite anecdote.

Dr.RenalNash said:

It helps to say which part of this you are uncertain about.

Mine went the same way, slower. Posting only so the count is not one.