Amino Acids are organic substances that form proteins as they mix. The building blocks of life are amino acids and proteins. Amino acids are left over after proteins are digested or broken down. The human body uses amino acids to produce proteins, which assist in digestion, tissue recovery, and a number of other bodily functions. The body may also use amino acids as a source of energy. Essential amino acids, non-essential amino acids, and conditional amino acids are the three types of Amino Acids. The body cannot produce essential amino acids. As a consequence, they must be extracted from food.