Amino acids are components of protein. That is to say, protein is formed by folding amino acid chains connected by one amino acid after another.

The basic structure of amino acids is a middle C (carbon atom), and four groups can be bound around C, two of which are -NH3 (amino group) and -COOH (carbonate group), the other is -H (hydrogen atom), and there is also an R group (representing that there can be many kinds of atoms or groups).

Glutamine is also an amino acid.

There are twenty kinds of amino acids, but there are only a few essential amino acids for human body, and others do not need special intake.

Essential amino acids: