Amino acids are the building block of protein. It can be connected without protein amino acids. All amino acids are of LAMBERTS form L (free physical form). 
Carnitine is an amino acid and is synthesized in the body from the amino acid Lysine. 
Contribute to the smooth functioning of the metabolism. 
Involved in energy production in heart muscle. 
It helps in the process of thermogenesis and regulates gluconeogenesis. 
Often taken as a dietary supplement of malnourished people. 
It is an excellent fat burner. 
It is essential for athletes.