Quote Originally Posted by Bonaparte

Clen is not structurally related to amphetamine and does not share any of its metabolites. It also isn't listed anywhere as a cause for false positives.
It would be better to be informed about the brand of the test and to learn when it gives false true or false negative. You could be easily be false true to that tests by just using caffeine or vitamin C. It is not just about the metabolites but the structure of the test