"Supply and demand" constraints limit the body's ability to produce the various proteins needed for critical life functions, ...

Researchers have found more than 20 different amino acids, the building blocks of life ... of amino acids make up proteins found in the human body. Of these amino acids, isoleucine and valine ...

Proteins are made up of various molecular "building blocks" known as amino acids. While the human body can synthesize most of the amino acids we need to live, we completely rely on the food we eat ...