l-carnitine's primary supposed ergogenic effect is that it might Carnitine Deficiency: What It, Causes, Symptoms, and More Carnitine Deficiency - MD Searchlight

Carnitine is a cofactor required for transformation of free long-chain fatty acids into acyl-carnitine, and for their subsequent transport into the mitochondrial matrix where they undergo beta-oxidation for cellular energy production

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In functional mitochondria, the supply of energy substrates is coupled with oxidative phosphorylation, which ensures a complete metabolic pathway for the generation of ATP

The supplement form of L-Carnitine is manufactured in labs and is available as L-Carnitine tartrate, L-Carnitine fumarate, and Acetyl-L-Carnitine

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