Sterling Compound Co.'s Epitalon came back with a discrepancy, specimen PI-LAB-2025-094 if you want to look at it yourself.
Purity was actually fine at 93.7%. The problem is the amount, 4.12mg measured against 5mg on the label. Which is the kind of thing a purity-only COA sails straight past.
Has anyone else bought from this lot? Trying to work out if it's just this batch or something broader.
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The people who get burned are almost never the ones who asked questions first.
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.
To answer the methodology question directly, Purity & Testing carries 25% because it is the dimension we can measure most reliably. The full weighting is published on the methodology page.
Commenting to find later.
TR TrialTracker ·
honestly same. thought it was just me