What does protein do in the human body?

  • Protein is necessary for supporting the building and repair of body tissues.
  • It regulates body processes, such as water balancing, transporting nutrients, and making muscles contract.


Protein is found in muscles, bone, hemoglobin, myoglobin, hormones, antibodies, and enzymes, and makes up about 45% of the human body. Muscle is approximately 70% water and only about 20% protein. Therefore, increasing muscle mass requires extra water, extra energy in the form of carbohydrates (to maintain the needs of that extra muscle), and a little extra protein.