Health Plus Amino LMethionine 500mg 60 tablet Amino acids are the building blocks of protein & are available from many sources including meat fish beans lentils vegetables & soya. There are in total 20 different amino acids that are classed either as essential which means the body cannot manufacture them them so we need to get them from food or nonessential which means the body can manufacture them. Whether essential or nonessential all amino acids are vital for good health.