l carnitine causes cancer L-Carnitine Carnitine: Genetic Variants Affecting Mitochondrial

Arginine feeds into nitric oxide production, which is central to vascular tone and blood flow

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Hum Mol Genet 1993

Our bodies create it from the amino acids lysine and methionine

Still to be determined is whether this gain of function is the result of changes in the structure or the function of the gastrointestinal microbial community