Amino Complex, Berry - 228g | ThorneThornes Amino Complex Amino acids are the building blocks of protein. Of the 20 amino acids that make up protein, nine are classified as essential amino acids (EAAs), those the body cannot produce itself. Therefore, they must be consumed through diet and supplementation to support the bodys internal production of energy. Thornes Amino Complex is a comprehensive blend of EAAs, which is high in branched chain amino acids (BCAAs) a group of amino acids .