Are L Carnitine and L Carnosine the Same? Anti Aging Systems 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 BCAA protects muscle., EAA builds muscle., Leucine flips the protein switch, But without all 9 essential amino acids, the job isnt finished., Add electrolytes, caffeine, and L carnitine and you have Which supplement is better Leucine an amino acid from the 3 Branched Chain Amino Acids or HMB and derivative of Leucine. Leucine is for building new muscle and stimulating muscle protein synthesis (