NOVAPEPTA · EDUCATIONAL REFERENCE
What does 99% purity actually tell you?
Understand why purity, identity, sterility and endotoxin testing answer different questions.
A percentage needs a method
A purity claim should be tied to a sample, batch, test method and result. A target specification is not the same as a completed batch test.
Identity is a separate question
Analytical techniques such as mass spectrometry help characterize molecular identity. A purity number alone does not establish that a vial contains the intended molecule or the labeled amount.
Purity is not a safety certificate
Sterility and bacterial endotoxins require distinct assessment. High chemical purity does not by itself establish suitability for injection or demonstrate a clinical benefit.
Sources
Prepared by NovaPepta · Updated August 27, 2026. Educational information only. Sources do not endorse NovaPepta products or certify any supplied batch.