Proteins are a molecule make up of amino acids. Amino acids are linked together in different combinations to form new proteins. They are the basis of body structures such as skin, hair, muscle and bone. Also, they make up substances such as enzymes, hormones, and antibodies, which are needed for the body to function properly. Protein foods are meats, dairy, nuts, beans, etc. Protein shake supplements are used by some people to make sure they are getting enough in their diet. Options for us in the supplement realm are whey (from milk), and various plant proteins such as fermented rice, pea, and fermented soy. Both provide good proteins. There is also collagen.