=There is no contradiction here. It is essential in the sense that your
=body needs it. It is non-essential in the sense that your body can
=produce enough of it without supplement.

And when you're in a technical discussion of amino acids, it's the latter
definition that's used almost universally.
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Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL