Creatine vs Carnitine: Do You Need Both? Differences Explained FeastGood.com L Cysteine VS N Acetyl L Cysteine Acetyl L Carnitine 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 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 Private Label Advanced Liver Support Softgel Capsules Manufacturer