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Lipovibes Pure Tryptophan. For more inner balance. Tryptophan is the precursor of the happiness hormone serotonin. A high serotonin level supports the feeling of happiness and contributes to a balanced mood. A sufficient supply of tryptophan is a basic requirement for the body's own serotonin production. In this respect, tryptophan is a useful support, especially in stressful situations. The trypt...