Protein molecules are made up of amino acids. The group of amino acids the human body requires to synthesize proteins are referred to as proteinogenic amino acids.
To distinguish proteinogenic amino acids that the body can produce itself (biosynthesize) from those that it can not, proteinogenic amino acids are classified into groups.
The human body is made up of cells that are small enough to need a microscope to be seen. One estimate is that the human body is made up of over 37 trillion (37,000,000,000,000) cells.
These 37 trillion cells are made up of about 200 kinds of different cell types. The brain, muscle, bone, hair, as well as all other parts of the body are made up of cells. The cells themselves are about 66% water
The remaining 34% of the capacity of a cell not occupied by water is made up mostly of proteins, along with lipids and carbohydrates.
Protein molecules are employed by the cell to perform actions. So much so that protein molecules have been called the workhorse molecules of life.
Protein molecules are required for everything we think, do, as well as what we physically are. They are involved in every aspect of our physical and mental existence including maintaining and repairing the organs and tissues of the body.
By utilizing thousands of alternate chemical reactions, the cells in your body use protein to convert the food and supplements you consume into the energy you require to live.