l-carnitine natural sources 5% Nutrition Rich Piana Liquid 3150 L-Carnitine: Benefits, Dosage, Side Effects,

Nature 444 , 10271031 (2006)

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do your own research on WADA list/your company policies to what you should avoid or could cause concern if you are wondering

Siliprandi and colleagues provided evidence that l-carnitine enhances high-intensity exercise by maintaining the acetyl CoA/CoA ratio constant, thereby allowing continuous flux through the pyruvate dehydrogenase complex and preventing lactate accumulation [37]

Still - you should talk to your doctor before you start taking it