To Evaluate the Safety and Efficacy of Pediococcus Acidilactici PA53 in Relieving Constipation in Adults

Inclusion Criteria: (1) age 18-70 years; (2) fewer than three SBMs per week and/or BSFS type 1 or 2; (3) ability to comply with study requirements; (4) provision of signed informed consent; (5) for participants of childbearing potential (including both sexes), agreement to use effective contraception from 14 days before screening until 6 months after study completion. \- Exclusion Criteria: (1) consumption of food or drugs known to affect gastrointestinal function (e.g., laxatives, probiotics) within 4 weeks prior to enrollment; (2) a change in dietary habits within the past month or planned during the study; (3) pregnancy, lactation, or intention to become pregnant; (4) history of severe cardiovascular, pulmonary, hepatic, renal, metabolic (e.g., diabetes, thyroid disease), malignant, or immunological disorders; (5) antibiotic use within 4 weeks prior to the study; (6) severe psychiatric illness; (7) any other condition deemed by the investigators to make the participant unsuitable for the trial. \-