Because I want to know what the truth is, and everything I'm finding says it's 95%. Unless you can come up with a credible source that says it's actually 99%, I can only go with what the data in front of me says.
ACS grade is >= 95% and "is acceptable for food, drug, or medicinal use".
I've always heard USP grade is the same as ACS grade.
No need for attitude.
Got a source for the 99% claim?
EDIT:
This is what chatgpt says:
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