Carnitine is not an amino acid (that is a protein), but has a structure similar to them and is grouped with amino acids. It’s job is to transport long chain fatty acids to the cellular level where they can be used as energy. Carnitine increases the use of fat as an energy source for your body.
Acetyl L-Carnitine is even more potent than L-Carnitine and performs other important functions for you. It has been extensively studied for its anti-aging benefits, especially for brain function.