is it normal to get food noise at week 93
is it normal to get food noise at week 93. Same spreadsheet I have been keeping since the start, nothing retrofitted.
Asked MKM for the theoretical mass alongside the certificate and they sent it without asking why.
Kept a reconstituted vial too long out of curiosity and learned something about solution stability I would rather have read.
Would rather be corrected in public than confident in private.
best — the order this archive was captured in
Purity by area percent tells you the sample is homogeneous. Mass spectrometry tells you what the homogeneous thing is. For a short peptide, the second question is the one worth paying for.
Which paper is that claim from, and was it in humans?
sequence confirmation is the test worth paying for
What method produced that purity number?
identity testing matters more here than purity does
Short peptides in solution are subject to hydrolysis and, depending on sequence, oxidation. Storage state and time in solution are practical variables that this board almost never discusses.
the tendon claims are the most repeated and the least evidenced
ask for the mass spectrum, not just the purity number
Sent a vial to VendorInvestigate: 99.6% against a claimed 99.0%, with the mass confirming the sequence. Both halves mattered to me.
Was there identity confirmation, or only a purity figure?
identity, quantity, stability — three separate questions
It is a fifteen-residue peptide with a published sequence, which makes synthesis straightforward and makes identity verification the meaningful test rather than an optional extra.
Disagree — that is a rodent study and you are stating it as a human effect. The distance between those is the entire argument.
Agreed — cheap to make is a double-edged fact and it explains a lot about this corner of the market.
Ask for the theoretical mass alongside the measured one. It is a one-line addition to a certificate and it converts a purity claim into an identity claim.
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