B. Lactis HN019 for Functional Constipation

Inclusion Criteria: * Age 18 to 70 years * Body mass index between 18.5 and 34.9 kg/m2 * Self-reported unsatisfactory defecation due to infrequent stools and/or difficult stool passage, which includes at least one of the following: symptoms of straining, difficulty expelling stool, a sense of incomplete evacuation, hard or lumpy stools, prolonged time to stool, or a need for manual maneuvers to pass stool. * Estimated stool consistency \< 4.0 on BSSF (self-reported at screening) within the past month prior to enrollment. * 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 * Consent to the study and willing to comply with study product and methods Exclusion Criteria: * Major gastrointestinal complication (e.g. Crohn's disease, ulcer) * Prior abdominal surgery that, in the opinion of the investigator, may present a risk for the subject or confound study results * Clinically significant underlying systemic illness that may preclude the subject's ability to complete the trial or that may confound the study outcomes (e.g. bowel cancer, prostate cancer, terminal illness) * Daily consumption of probiotics, prebiotics, fermented milk, and/or yogurt within 2 weeks of screening and throughout the trial other than the provided study products * Non-laxative constipation medication use within 2 weeks of screening, laxative use within 48 hours of screening (rescue medication allowed for intolerable symptoms during study) * Daily use of anticholinergic agents, opioid analgesics, calcium supplements, calcium-channel blockers, and NSAIDs * Anticipated major dietary or exercise changes during the study * Systemic steroid use * Eating disorder * Contraindication to dairy products (e.g., intolerance to lactose or any substance in the study product) * History of alcohol, drug, or medication abuse * Pregnant or lactating female, or pregnancy planned during study period * Participation in another study with any investigational product within 30 days of screening * Investigator believes that the participant may be uncooperative and/or noncompliant and should therefore not participate in the study