
99% purity does not mean a 10 mg vial contains exactly 9.9 mg of peptide.
Purity and content are different.
Purity tells you how clean the peptide is compared with the impurities detected by the test.
Content tells you how much peptide is actually inside the vial.
During production, some manufacturers add a controlled overage to cover documented process losses and make sure the finished vial still meets its 10 mg label claim.
But that does not mean every 10 mg vial is filled with 11 or 12 mg.
The final assay is what matters.
— Song
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