Fact: Protein is full of amino acids, which supplements the growth rate of particular organs. Therefore, since it contributes to the high amount of amino acid presence, muscles are not the only thing that protein helps grow. Instead, it supports the growth of ligaments, hair, hormones, joints, bone, tendons, antibodies, enzymes, and even HDL/LDL cholesterol. Moreover, protein helps with blood glucose regulation and immunity boost as well.