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doi:10.1038/nrd.2018.45 96

[DOI] [PubMed] [Google Scholar] 14.Brass EP, Adler S, Sietsema KE, Hiatt WR, Orlando AM, Amato A, CHIEF Investigators Intravenous L-carnitine increases plasma carnitine, reduces fatigue and may preserve exercise capacity in hemodialysis patients
These "trigger points" can cause referred pain in other areas, such as tension headaches