Amino acids are on the base of the constitution of proteins and other peptides, even if they are not the only constituents.
Let us note that our body has a continual need in amino acids which it is necessary to satisfy necessarily. For all the amino acids, the daily nutritional need of our body is considered at a minimal average from 44 to 56 grams a day according to GDR (Recommanded Daily Allowance). Amino acids can be estimated at 22 all in all among which 14 being considered as no main things in our body and only 8 playing the role of essential amino acids. The use of the term "main things" for these last 8 amino acids is simply due to the fact that they cannot be synthetized by the man. The only means thus to have them is the way of the food.
Amino acids play multiple roles in our body which all contribute one way or another to his smooth running and to our well-being.