In reading a COA (Certificate of Analysis), I came across an Assay line:
The Assay is 100.5% where "Lower Limit" is 98.5 and "Upper Limit" is 101.0
This product is L-Cysteine Hydrochloride Monohydrate. How can the Assay be over 100%?
I have found this statement: "If the substance under test is purer than the standard, the assay comes more than 100 pct." If that is the case, then the question becomes, where can I find out about this standard?