l-carnitine side effects long-term l-carnitine: Nutrition, pathology, and health benefits Can L-Carnitine Cause Side Effects?
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364,366,367 In addition, those who cannot side-sleep may benefit from simply rotating the head to a side, possibly with the help of a specialized pillow, while sleeping in a supine position

doi: 10.1039/D1FO02454J, PMID: [DOI] [PubMed] [Google Scholar] 186

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Taking L-carnitine by mouth or intravenously (by IV) seems to improve exercise tolerance in people with chest pain