To evaluate the effectiveness and safety of the use of probiotics as food supplements in regulating the intestinal habit of subjects with chronic constipation, in comparison with placebo.

Inclusion Criteria:

Patients with chronic constipation (duration more than 3 months with less than three bowel movements per week and/or Bristol Scale 1 and 2).

Exclusion Criteria:

1. Diabetic patients.
2. Pregnant patients.
3. Breastfeeding patients.
4. Patients requiring antibiotic treatment.
5. Patients requiring treatment with tricyclic antidepressants, antiepileptics, antihistamines, antiparkinsonians, antipsychotics, antispasmodics, verapamil, monoamine oxidase inhibitors, opiates, sympathomimetics, antacids (with aluminum and calcium), antidiarrheals and nonsteroidal anti-inflammatory drugs.
6. Patients who change the type of diet during the study.
7. Patients with allergy or intolerance to any of the ingredients in the formulation of the product under study.
8. Subjects with a history of pharmacological, alcoholic, or other substance abuse, or other factors that limit their ability to cooperate during the study.
9. Excessive alcohol consumption (>3 glasses of wine or beer/day).
10. Subjects whose condition does not make them eligible for the study, according to the researcher.

Double（Participant, Investigator)