L Carnitine and Creatine are both game changers for fitness, but they each shine in different ways! SAVE this as your quick guide! L Carnitine, found in red meat, fish, and chicken, supports fat N Acetyl L Cysteine, or NAC, is the acetylated form of the amino acid L Cysteine. It possesses strong antioxidant properties due to the presence of a thiol group ( SH). This form of cysteine is Difference between L Carnitine and L Carnitine L Tartrate L Cysteine Benefits, Supplements, Dosage, Foods and Side Effects The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation