L-Tryptophan from Granions Laboratories is a natural food supplement for people who want to improve the quality of their sleep and regulate their mood. It is ideal for people following a slimming diet. L-Tryptophan from Granions Laboratories is a natural food supplement for people who wish to improve the quality of their sleep and regulate their mood. It is ideal for people following a slimming diet. It is a real precursor of serotonin. L-tryptophan is a trace element that also helps regulate the appetite of those with a sweet tooth. It has a real satiating effect. L-Tryptophan from Granions Laboratories helps you to recover your good mood and your energy for the good weather. INDICATIONS Overwork, mood disorders, low morale affecting the quality of sleep.