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However, whilst improved semen characterisitics have been reported, very few studies have recorded pregnancy outcomes after treatment of infertile men with carnitines, and none have considered live birth as a primary outcome (Zini et al

Endogenous biosynthesis Humans can synthesize L-carnitine from the amino acids lysine and methionine in a multi-step process occurring across several cell compartments (cytosol, lysosomes, and mitochondria) (reviewed in 6)

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(2014) PLoS One | doi:10.1371/journal.pone.0084589 Stephens FB, Marimuthu K, Cheng Y, et al.: Vegetarians have a reduced skeletal muscle carnitine transport capacity

It is not a true vitamin because it is also biosynthesized endogenously from dietary amino acids (methionin, lysine), especially in the liver and in the kidneys [29,30]