4+ Nutrition GLUTA+Glutamine is the amino acid that is most present in our organism (70% in the myocytes) and it very easily passes the cellular membranes. It is well known that its levels tend to decrease in all conditions of stress. It has so many potential functions that it is difficult to establish the most important ones and even more difficult to create a classification of those with the greatest impact. It is the precursor of the purine and pyrimidine bases,