Amino acids are important organic compounds that are present in food and in the proteins in our body. They are divided into substitutes that our body can produce itself and irreplaceable that our body cannot synthesise on its own. Essential amino acids must be attributed to the body from food or food supplements. Every cell in our body uses and needs amino acids for normal functioning – such as muscle, skin, tendons, ligaments, organs, glands, nails, hair and etc.