L Carnitine Benefits, Side Effects & Dosage SelfDecode Supplements Essential L Carnitine Optimal Health Systems L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians 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 More than 95% of your L Carnitine stores are contained in your muscles, along with trace amounts in your blood, liver, heart and kidneys. L Carnitine is an essential amino acid that helps you