Herbal supplements may seem safe because they are natural, but for people with chronic kidney disease (CKD), they can pose serious risks. They may harm your kidneys, interact with medications, or increase History of L carnitine: Implications for renal disease Journal of Renal Nutrition Acetyl L Carnitine for Heart, Diabetes & Kidney Health Kidney Coach 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