Intestinal microbiota metabolism of l carnitine, a nutrient in red meat, promotes atherosclerosis Nature Medicine Acetyl L carnitine physical chemical, metabolic, and therapeutic properties: relevance for its mode of action in Alzheimer's disease and geriatric depression Molecular Psychiatry Frontiers Acetyl L carnitine ameliorates atherosclerosis in LDLR mice by modulating cholesterol metabolism through SREBP2 dependent cholesterol biosynthesis The Role of Lipids and Lipoproteins in Atherosclerosis Endotext NCBI Bookshelf