l-carnitine claims JYM L-Tartrate L-Carnitine 3000 - Green Apple

The prevalence of complex I, II, III, IV, V and multiple complex deficiencies was not significantly different between children with MD with and without ASD, nor was the prevalence of elevated citrate synthase or mtDNA abnormalities

Br J Pharmacol 1984 Jun;82(2):533-42 [abstract] Hagen TM, Moreau R, Suh JH, Visioli F

Taking a thyroid medication can boost the production of L-carnitine, but it can also work as a vacuum, taking the L-carnitine from the body and resulting in an overall deficiency

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Cederblad G, Larsson J, Nordstrom H, Schildt B: Urinary excretion of carnitne in burned patients