l carnitine cfs me Conceptual foundations of acetylcarnitine supplementation in neuropsychiatric long COVID syndrome: a narrative review Correlation heatmap. MFI, Multidimensional Fatigue

Approximately 75% of carnitine in the human body is derived from dietary sources, such as animal products such as red meat and dairy products (with high amine content), and 25% is synthesized endogenously from lysine and methionine in the liver and kidneys

, L- Easynutrition

doi: 10.1016/j.ymgme.2013.05.014

Supplements Your body naturally produces L-Carnitine from the amino acids lysine and methionine, but this process depends on having enough vitamin C

revealed the incorporation of 13 C label from labelled acetyl-l-carnitine into glutamate and GABA neurotransmitters, suggesting that acetyl-l-carnitine was used as a substrate for their biosynthesis [25]