Probiotic Effect on Gastrointestinal Symptoms (FLORABIOTIC REFUERZO).

The goal of this randomized clinical trial is to evaluate the effect on the microbiota and the reduction in the number and/or intensity of symptoms of gastrointestinal discomfort of consuming a probiotic or placebo for 6 weeks in adult women and men. The main questions to answer are: 1. To study changes in the alpha diversity of the microbiota. 2. To evaluate changes in the salivary cortisol. For this purpose, a randomized, double blind crossover study has been designed. Target sample size is 30 subjects. Participants will be allocated in two groups for 16 weeks (6 weeks consuming one of the products + 4 weeks wash-out period + 6 weeks consuming the other product). * Group 1 (n=15): 6 weeks daily consumption of one probiotic capsule + 4 weeks wash-out period+ 6 weeks daily consumption of one placebo capsule. * Group 2 (n=15): 6 weeks daily consumption of one placebo capsule + 4 weeks wash-out period+ 6 weeks daily consumption of one probiotic capsule.