Amino acids are the 'building blocks' of protein and to this extent are essential to the human body. Amino acids in our diet come from protein rich sources such as meat, fish, dairy products, and vegetables such as legumes, peas, and grains. Bodybuilders and athletes can especially benefit from further supplementing with amino acids because they aid in repair, growth, and development of muscle tissue.
The body requires 20 different amino acids of which 8 are referred to as essential amino acids which cannot be synthesized by the human body. Animals and plants manufacture proteins that contain these essential amino acids