L Carnitine: Benefits, Uses, Side Effects, and More Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Choline Linus Pauling Institute Oregon State University l Carnitine and its attributed functions in fish culture and nutritiona review ScienceDirect L Carnitine CAM Cancer Vaginal epithelial dysfunction is mediated by the microbiome, metabolome, and mTOR signaling: Cell Reports