acetyl l carnitine deficiency L-Carnitine | Linus Pauling Institute Acetylcarnitine - Wikipedia
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BMC Genomics 14, 423 (2013)
10.1016/j.jhep.2016.04.010 [DOI] [PMC free article] [PubMed] [Google Scholar] 99.Cakmak E, Duksal F, Altinkaya E, Acibucu F, Dogan O, Yonem O, et al

It helps regulate mitochondrial fuel switching and supports overall energy metabolism

Conclusion L-carnitine, when administered alongside conventional DMARDs therapy, demonstrated significant improvements in systemic inflammation and clinical manifestations among patients with RA

Or the participant might be on a medication that can react to the new drugs active ingredient which would also disqualify them
