Patient description: The patient is a 57-year-old man with abdominal pain and vomiting. The pain started gradually about 20 hours ago in the epigastric and periumbilical regions, radiating to his back. He drinks around 60 units of alcohol per week and smokes 22 cigarettes per day. He is healthy with no history of allergies or using any medications. His family history is positive for type 2 diabetes (his father and sister). He lives alone and has no children. The abdomen is tender and soft. His bowel sounds are normal. His heart rate is 115/min and blood pressure 110/75 mmHg. The lab results are remarkable for leukocytosis (19.5), urea of 8.5, high CRP (145), high amylase (1200) and Glc level of 15. Cross-sectional imaging was negative for obstructive pancreatitis.

Clinical trial eligibility criteria: eligible ages (years): 25.0-65.0,  Lactose Intolerance Voluntary, written, informed consent to participate in the study 2. Agreement to comply with the protocol and study restrictions 3. Healthy females and males of age 25 to 60 years (inclusive) 4. Self-declared, suspected or medically diagnosed lactose intolerance 5. Increase of more than 20 ppm in breath hydrogen within 3 h from the baseline fasting breath hydrogen value 6. Participants who agree to maintain their usual dietary habits throughout the trial period 7. Participants who agree not to consume probiotics, prebiotics, fermented milk, and/or yogurt containing probiotics during the intervention period (Visits 3-5) and two weeks before Visit 3 (2 weeks after screening visit) 8. Females of child-bearing potential who agree to use a medically approved method of birth control 9. Ability of the participant (in the investigator's opinion) to comprehend the full nature and purpose of the study including possible risks and side effects 10. Covered by Health Insurance System and / or in compliance with the recommendations of National Law in force relating to biomedical research  Gastrointestinal disorder or disease (e.g. Crohn's disease, ulcer, irritable bowel syndrome (IBS), Celiac disease, small intestinal bacterial overgrowth (SIBO), pancreatitis and disorders affecting gastrointestinal motility) 2. Diagnosed type 1 or type 2 diabetes 3. Prior abdominal surgery that, in the opinion of the investigator, may present a risk for the participant or affect study results 4. Ongoing or recent (last 1 month) antibiotic treatment. 5. Use of laxatives or drugs known to affect gut motility 1 month preceding the screening visit and during the study 6. Ongoing or recurrent use of proton pump inhibitors 7. Colonoscopy within 3 months before screening 8. History of recurrent colon cleansing and/or a colon cleansing within 3 months before screening 9. Gastrointestinal infection within 1 month before screening or during the trial 10. Clinically significant underlying systemic illness that may preclude the participant's ability to complete the trial or that may affect the study outcomes (e.g. bowel cancer, prostate cancer, terminal illness) 11. History of diagnosed coronary heart disease/cardiovascular disease or artificial heart valve 12. Any obstructive or restrictive respiratory syndrome/disease that may impact breath test (e.g. asthma or chronic obstructive pulmonary disease (COPD)) 13. Regular use of tobacco, snuff, nicotine and e-cigarette, and possible other inhaled products. Light smokers (less than 5 cigarettes per day) who agree not to smoke during the whole duration of the study may be included. 14. Self-declared history of alcohol abuse (for females: >3 drinks on any single day and >7 drinks per week; for males: >4 drinks on any single day and >14 drinks per week) 15. Self-declared use of illicit drugs within 4 weeks preceding the screening visit 16. Pregnant or lactating female, or pregnancy planned during study period 17. Participants under administrative or legal supervision. 18. Participation in another study with any investigational product within 60 days of screening 19. Clinically significant abnormal values in safety blood tests at screening 20. Other reasons that, in the opinion of the Investigator, make the participant unsuitable for enrolment 21. Who would receive more than 4500€ as indemnities for his participation in biomedical research within the last 12 months, including the indemnities for the present study