Vector Peptide Supply's Retatrutide came back with a discrepancy, specimen PI-LAB-2025-108 if you want to look at it yourself.
Purity was actually fine at 97.3%. The problem is the amount, 4.94mg 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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That is the distinction I was trying to make, said better.
Bumping.
Mass spec gives you molecular weight, which confirms identity but says nothing about whether the sequence is correct. Two different peptides can share a mass.
Worth clarifying since it comes up a lot: a company's score moves when new results come in, not on a schedule. The score history on each profile shows every change.
Watched three vendors rebrand under new names after bad results. Check domain registration dates.
Genuinely asking, not being difficult: what is the actual source for that? Everyone repeats it and nobody links anything.
tbh half the vendor sites look like they were built by the same guy
BA batch_ravi ·
Worth separating two things here. Purity tells you what fraction of the material is the target compound. Identity tells you whether the target compound is what the label says. A product can pass one and fail the other, and they are different assays.