Why Amino Acids Are Essential and Where to Buy Them Amino acids are the fundamental building blocks of proteins, vital for muscle repair, energy production, immune support, and overall wellness. Of the 20 standard amino acids, nine are essential amino acids (EAAs) histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine that your body […]