Well, this one's not great. Specimen PI-LAB-2025-111 just went up for Cascade Research Group's Tesamorelin and it failed.
Purity came in at 57.8%. From what I understand they buy a second one from a different lot and send it to a different lab before they'll publish a failure, so this isn't a one-off reading.
Has anyone else bought from this lot? Trying to work out if it's just this batch or something broader.
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Yes, and the same page has the older cycle for comparison.
The specimen reports link out to the full lab document, including the method and the lot number. Took me a while to notice they were clickable.
ha, fair
genuinely useful post, wish more threads were like this
The figure everyone quotes traces back to a single 2019 paper with n=8. It gets cited as though it were established and it is really not.
AS assay_mira ·
Reversed-phase HPLC with UV detection at 214nm is the standard here because the peptide bond absorbs there. If a vendor reports purity without stating the method or wavelength, the number is not comparable to anything.