Frontiers Dietary supplementation with L carnitine elevates intracellular carnitine levels and affects gene expression of SLC25A20 and COX4I1, as well as non mitochondrial respiration of bovine blood cells during systemic immune challenge Mitochondrial diseases Nature Reviews Disease Primers Carnitine Metabolite of the month biocrates life sciences gmbh L carnitine is primarily synthesized in the liver from the amino acids lysine and methionine through a series of four enzymatic reactions, with the liver and kidneys converting the precursor butyrobetaine into active Carnitine: Top 3 Anti Aging Benefits of This Super Nutrient Carnitine Shuttle an overview ScienceDirect Topics