does l carnitine upset the stomach L-Carnitine Benefits, Uses, Dosage, Foods,

Neurotoxicol Teratol 60:223 De Simone R, Ramacci MT, Aloe L (1991) Effect of acetyl-l-carnitine on forebrain cholinergic neurons of developing rats

Notably, thyroid hormones may facilitate augmented carnitine synthesis in the liver by increasing -butyrobetaine hydroxylase (BBD) activity and gene expression, which may constitute a feedback regulatory loop between thyroid hormones and carnitine [80]

Carnitine palmitoyl transferase family Carnitine palmitoyltransferase 1A CPT1A is present mostly in the colon, duodenum, liver, kidney, and small intestine, and its deficiency results in a rare autosomal recessive metabolic disorder of long-chain FAO 19

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Neuron 93 , 12961313 (2017)