Evaluation of the effects of butyrate ( BitirBioma) and palmitoylethanolamide( PEA=PeaBioma) on intestinal permeability and gut microbiota composition in patients with irritable bowel syndrome. Study B/P 3\_1 is an interventional study involving the use of food supplements on the market (BitirBioma Plus and PeaBioma Plus), single-center, double-blind, placebo-controlled, crossover, randomized, in n=50 patients with bowel syndrome irritable, diarrheal and mixed variant (IBS-D and IBS-M), lasting for one year. The study has two arms: Group 1: n=25 Treatment A e Group 2: n=25 Treatment B (with - Treatment A: 3 capsules/day of butyrate (625 mg) + 3 capsules/day PEA (200 mg) at a ratio of dosage of 3/1 - Treatment B: Placebo (3+3/day capsules of starch). Eligible subjects with IBS will be randomized in a 1:1 ratio to treatment A or treatment B for six weeks. After the first treatment period, there is a 14-day washout period. Hence, individuals will be treated with B/A treatment for additional six weeks, according to the crossover design. In the two treatment periods, subjects will be required to complete a visual analogue score VAS questionnaire to assess gastrointestinal symptoms and Stool Bristol Scales. During the visit, the subjects will have to record Questionnaire Rome IV to evaluate their quality of life. At the same time, it will be theirs required to provide: * fecal sample for the evaluation of the composition of fecal microbiota (Biomaplan Kit) * a urine sample for the evaluation of intestinal permeability (Gastropack) a capillary blood sample and a serum sample for the detection of Zonulin (Kit Healthy gut and Immundiagnostik AG ) * a capillary blood sample and a serum sample for the detection of Zonulin (Kit Healthy gut and Immundiagnostik AG )
Age range
18 Years – 70 Years
Sex
ALL
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Evaluation of the variation of gut microbiota composition (Microbiota test )
Timeframe: 9 months