Intervention Study to Evaluate a Probiotic in Mild to Moderate Psoriasis Patients

Inclusion Criteria: * Plaque psoriasis diagnosed at least a year before the beginning of the treatment. * Mild to moderate Psoriasis with a PASI score higher than 6 with no new flare-up in the previous four week to the beginning of the treatment. * Patients capable of giving their informed consent to their participation in the study * For women in fertile age, a negative pregnancy test before the beginning of the treatment, and the use of active contraceptive methods is required Exclusion Criteria: * Patients suffering from Crohn disease, hepatic cirrhosis, morbid obesity, VIH-positive or any other active infection. * The use of any systemic, oral or parenteral psoriasis treatment in the last three months. * The use of any antibiotic, probiotic or/and prebiotic in the last two weeks. * The use of natural product with proved efficiency on health (apart from multivitamin and multimineral products) * Any hepatic, renal, endocrine, respiratory, neurologic or cardiovascular disease. * Pregnancy and breastfeeding. * Patients not being capable of giving their informed consent or not being capable of following the study conditions.