l carnitine, a friend or foe for cardiovascular disease? A Mendelian randomization study BMC Medicine Springer Nature Link 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 Carnitine and Acylcarnitine Analysis Service LCMS MS Quantification Creative Proteomics Evidence based Analysis on Supplements & Nutrition Examine