To ensure sufficient intake of magnesium, and to maintain production of mind calming serotonin. Tryptophan is amino acid, it is also a precursor of serotonin. B-vitamins maintain the function of the nervous system. They are also needed in serotonin production. Magnesium is an important mineral especially for the nervous system and the muscles, it has also calming effect. Stressless is desinged for horses that are sensitive for different stressors (competition, transport), and on all horses during overall nervousness.