The proteins we consume are broken down into amino acids in the intestine, and then used as building blocks of new proteins. There are as many as 20 essential amino acids, eleven of which are produced by our bodies. The remaining nine essential amino acids (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine) must therefore be obtained from our diet, because the body is unable to produce them on its own.
Our overall diet and amino acid balance are keys to promoting wellbeing. The same amino acids should not be taken for long periods, but as supplements to treat momentary imbalances. It is, of course, important to ensure an adequate and good quality protein intake as part of your diet. Excellent sources of plant protein include beans, lentils, seeds, nuts and tofu.