l carnitine cause heart arrhythmia Pathobiological Relationship of Excessive Dietary Intake of Choline/L- Carnitine: A TMAO Precursor-Associated Aggravation in Failure in Sarcopenic Patients Research Breakdown on L-Carnitine -
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Nutrients, 10(3), 349

[DOI] [PMC free article] [PubMed] [Google Scholar] 134.Burwinkel B, Kreuder J, Schweitzer S, Vorgerd M, Gempel K, Gerbitz KD, Kilimann MW

Here's a little background info on it in case you're curious like me
