Effect of a Multistrain Probiotic on Cold Symptoms in Healthy Patients with an History of Upper Airways Infection

Inclusion Criteria: people who: * are willing and capable of joining the study * are willing of not varying their routine (lifestyle, physical activity..) during the study * are willing of not varying their diet during the study * are willing of using only the testing product during the study * are willing of not using products that may interfere with the testing product * have not recently joined similar studies * have signed informed consent Exclusion Criteria: subjects: * not filling the inclusion criteria * with suspected or confirmed sensibility to one or more product component * with chronic diseases (cardiovascular congenital diseases, hepatic diseases, renal disease, immunodeficiency) * undergoing antibiotic/pharmacological treatment * with other concomitant disease (infective, respiratory, gastrointestinal, immune) * who underwent an immunomodulating treatment in the past 4 weeks * who underwent an immunosuppressant therapy in the past 3 months * with severe disease ongoing * who abuse of alcohol and/or drugs * who are considered not eligible by the investigator * not able to communicate due to language barriers, mental issues or cerebral functioning impairment