| Recruiting | Milk for Diabetes Prevention NCT06513026 | Albert Einstein College of Medicine | N/A |
| Not Yet Recruiting | Screening of Lactose Intolerance Among IBS Patients Diarrhea Dominant NCT06931379 | Assiut University | — |
| Recruiting | Proper Dietary Management, Follow-up, and Lactase Enzyme Supplementation for Lactose Intolerance NCT06773650 | European Institute of Oncology | — |
| Completed | MSOT for Assessment of Intestinal Transit Time in Lactose Intolerance Patients NCT06617364 | University of Erlangen-Nürnberg Medical School | N/A |
| Recruiting | Lactobreath: A Study to Diagnose Lactose Intolerance Using Breath Markers NCT06177938 | ETH Zurich | N/A |
| Completed | Effect of a Combination of Lactase and L. Salivarius DSM 34078 in Individuals With Lactose Intolerance NCT06107088 | Novozymes A/S | N/A |
| Completed | Lactose Intolerance in Infants With Gastrointestinal Disturbances NCT06789068 | Ain Shams University | N/A |
| Not Yet Recruiting | The Role of Irritable Bowel Syndrome in Lactose Intolerance (LION) NCT05100719 | University of Pecs | N/A |
| Unknown | A Bifido Bacteria to Improve Lactose Digestion and Tolerance NCT05668468 | Purdue University | N/A |
| Completed | Lactase Enzyme Supplementation for Growth and Feeding Tolerance in Preterm Infants NCT07494123 | Cairo University | N/A |
| Unknown | Comparing the Inflammation, Maldigestion and Symptoms Due to Commercial Milk and A2 Milk NCT05660278 | Purdue University | N/A |
| Unknown | Comparing the Adaptation of Commercial Milk and A2 Milk in Lactose Maldigesters NCT05669274 | Purdue University | N/A |
| Completed | Evaluation of GIMate Handheld Hydrogen Breath Monitor for Diagnosis of Lactose Malabsorption NCT04754724 | Vivante Health | N/A |
| Completed | Effect of a Probiotic With High Beta-galactosidase Activity on Patients With Lactose Intolerance NCT05367453 | Instituto de Investigación Hospital Universitario La Paz | N/A |
| Completed | Does Daily Supplementation of Lactobacillus Acidophilus MPH734, for One Week, Affect Acute (Immediate), Subacu NCT04531033 | Lemuel W. Taylor IV | N/A |
| Unknown | Effect of B.Bifidum 900791 Intake in Adult With Hypolactasia and Lactose Intolerance NCT03952988 | University of Chile | N/A |
| Completed | Effect of I31 Probiotic on Lactose Intolerance NCT04164394 | Hospital Juarez de Mexico | N/A |
| Unknown | Fructose and Lactose Intolerance and Malabsorption in Functional Gastrointestinal Disorders NCT02085889 | Brain-Gut Research Group | — |
| Completed | Association Between Lactase Deficiency, and the Small Intestinal Microbiome in Adults. NCT03860051 | Indiana University | — |
| Completed | Effect of Probiotic Supplementation on Lactose Maldigestion Induced by Lactose Solution NCT03814668 | Danisco | N/A |
| Completed | Evaluation of the Efficacy, Durability, Safety, and Tolerability of RP-G28 in Patients With Lactose Intoleranc NCT03597516 | Ritter Pharmaceuticals, Inc. | Phase 3 |
| Completed | Effect of a Standard Meal on the Pharmacokinetic Profile of RP-G28 in Healthy Adult Male and Female Subjects NCT03563846 | Ritter Pharmaceuticals, Inc. | Phase 1 |
| Completed | Efficacy, Safety, and Tolerability Study of RP-G28 in Subjects With Lactose Intolerance NCT02673749 | Ritter Pharmaceuticals, Inc. | Phase 2 / Phase 3 |
| Completed | Incidence of Lactose Intolerance Among Self-reported Lactose Intolerant People NCT02878876 | a2 Milk Company Ltd. | Phase 4 |
| Completed | HYBRID: Hydrogen Breath Test in Lactose Digestion NCT02703987 | Danone Asia Pacific Holdings Pte, Ltd. | N/A |
| Completed | Evaluation of LacTEST for the Diagnosis of Hypolactasia in Adults and Elderly Patients Presenting With Clinica NCT02636413 | VenterPharma | Phase 4 |
| Completed | β-galactosidase Producing Probiotic Strains to Improve Lactose Digestion NCT02518295 | Société des Produits Nestlé (SPN) | N/A |
| Completed | Modulation of Lactase Expression by a New PPARgamma Ligand in Duodenal Biopsies NCT02902016 | University Hospital, Lille | N/A |
| Completed | Effects Comparison of A1 and A2 Milk on Gastrointestinal Physiology, Symptoms and Cognitive Behavior NCT02406469 | a2 Milk Company Ltd. | Phase 4 |
| Completed | Comparison of the Colonic Metabolism in Patients With Lactose Intolerance and Healthy Controls NCT02171403 | KU Leuven | — |
| Completed | The Effect of Probiotics on Lactose Intolerance NCT01593800 | Rabin Medical Center | N/A |
| Completed | Clinical Utility of Breath Tests in GI NCT03261856 | Augusta University | — |
| Completed | A Non-inferiority, Multicenter and Randomized, Multiple-Dose Study About a Treatment to Hypolactasia NCT01145586 | Eurofarma Laboratorios S.A. | Phase 3 |
| Completed | Effectiveness, Safety and Tolerability Study of RP-G28 for Symptoms Associated With Lactose Intolerance NCT01113619 | Ritter Pharmaceuticals, Inc. | Phase 2 |
| Unknown | The Effects of Lactose Intolerance on Gastrointestinal Function and Symptoms in a Chinese Population NCT01286597 | Sir Run Run Shaw Hospital | N/A |
| Completed | Effects of Raw Versus Other Milk Sources on Lactose Digestion NCT01129791 | Stanford University | N/A |
| Terminated | Prevalence of Lactose Intolerance Following Stem Cell Transplantation NCT00247806 | University of British Columbia | — |
| Completed | Perceived Lactose Intolerance NCT01331265 | Baylor College of Medicine | — |
| Completed | Amount of Lactose Causing Symptoms in People With Lactose Intolerance and Ulcerative Colitis NCT00403923 | University Hospitals, Leicester | — |
| Withdrawn | Validation of a Home-screening Test for Lactose Intolerance NCT00844766 | University Hospitals, Leicester | — |
| Completed | Amount of Lactose Causing Symptoms in Lactose Intolerant People NCT00395954 | University Hospitals, Leicester | — |
| Completed | Effects of Lactose on Fecal Microflora NCT00599859 | Sir Mortimer B. Davis - Jewish General Hospital | N/A |