What proteins do?

Proteins serve in two major roles. Some of them make up part of the structure of our bodies. Others are enzymes. An enzyme is a protein that works like a tool. It helps a particular chemical reaction take place.
Protein helps in building and repairing the body tissues. it also produces enzymes and hormones, helps in building up stamina.
They do most of the work in cells and provide structure, function, and regulation to the cell.