Lactose IntoleranceNCT05660278
Comparing the Inflammation, Maldigestion and Symptoms Due to Commercial Milk and A2 Milk
A study testing Milk containing A1 and A2 beta-casein and Milk containing only A2 beta-casein in people with Lactose Intolerance, run by Purdue University at 1 site in United States.
Trial summary
Cow's milk contains two types of β-casein: A1 and A2. It is evident from human clinical trials that milk with A1 protein produces more hydrogen and symptoms of lactose intolerance. A pro-inflammatory μ-opioid peptide BCM-7 is released from A1 but not from A2. Read more about this study
- Who is it for?
- Ages 18 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Lactose Intolerance
- What is being tested?
- Milk containing A1 and A2 beta-casein and Milk containing only A2 beta-casein
- How many people
- 35 participants
- Where
- 1 siteUnited States
- Study dates
- 18 Jan 2022to Aug 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- • Ability/desire to provide informed consent
- Aged 18 to 65 years of age inclusive at screening
- Current or recent history of intolerance to or avoidance of dairy of at least one month duration (by self-report and self-reported symptoms).
- Agrees to refrain from all other treatments and products used for dairy intolerance (e.g., Lactaid® Dietary Supplements) during study involvement
- Willing to return for all study visits and complete all study related procedures
- Able to understand and provide written informed consent in English
Who cannot join
- • Allergic to milk
- Currently pregnant
- Currently lactating
- Cigarette smoking or other use of tobacco or nicotine containing products within 3 months of screening
- Diagnosed with any of the following disorders known to be associated with abnormal gastrointestinal motility such as; Gastroparesis, amyloidosis, neuromuscular diseases (including Parkinson's disease), collagen vascular diseases, alcoholism, uremia, malnutrition, or untreated hypothyroidism
- History of surgery that alters the normal function of the gastrointestinal tract including, but not limited to: gastrointestinal bypass surgery, bariatric surgery, gastric banding, vagotomy, fundoplication, pyloroplasty [Note: history of uncomplicated abdominal surgeries such as removal of an appendix more than 12 months prior to screening will not be excluded]
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- Past or present : Organ transplant, chronic pancreatitis, pancreatic insufficiency, symptomatic biliary disease, Celiac disease, chronic constipation, diverticulosis, inflammatory bowel disease (IBD), ulcerative colitis (UC), Crohn's disease (CD), small intestine bacterial overgrowth syndrome (SIBO), gastroparesis, gastro-esophageal reflux disease (GERD), Irritable Bowel Syndrome (IBS) or any other medical condition with symptoms that could confound collection of adverse events.
- Active ulcers, or history of severe ulcers
- Diabetes mellitus (type 1 and type 2)
- Congestive Heart Failure (CHF)
- Human Immunodeficiency Virus (HIV), Hepatitis B or Hepatitis C
- Height: ___ Weight: ___ BMI: ___
- o Weighing <16.5 kg and BMI > 35 kg/m2
- Recent bowel preparation for endoscopic or radiologic investigation within four weeks of screening (e.g., colonoscopy prep)
- Use of concurrent therapy(ies) or other products (e.g., laxatives, stool softeners, Pepto Bismol®, Lactaid® Dietary Supplements) used for symptoms of dairy intolerance within 7 days of screening
- Chronic antacid and/or PPI use
- Recent use of systemic antibiotics defined as use within 30 days prior to screening
- Recent high colonic enema, defined as use within 30 days prior to screening
- Any concurrent disease or symptoms which may interfere with the assessment of the cardinal
- symptoms of dairy intolerance (i.e., gas, diarrhea, bloating, cramps, stomach pain)
- History of ethanol (alcohol) and/or drug abuse in the past 12 months
- Currently undergoing chemotherapy
- Use of any investigational drug or participation in any investigational study within 30 days prior to screening
- Prior enrollment in this study
- Any other conditions/issues noted by the study staff and/or Principal Investigator that would impact participation and/or protocol compliance
Trial locations and contacts
1 site in 1 country.
Tracy Eaton, MSW contact
United States1 site, 1 recruiting
- Recruiting
Purdue University
West Lafayette, Indiana, 47906
Dennis Savaiano, PhD, 765-427-7826 ext. +1, savaiano@purdue.edu
Tracy Eaton, MSW, 7654946083 ext. +1, tkeaton@purdue.edu
About this study
Official title: Comparing the Acute Effects of A1 Containing Commercial Milk and A2 Milk on Inflammation, Lactose Intolerance and Lactose Maldigestion in Lactose Maldigesters
Cow's milk contains two types of β-casein: A1 and A2. It is evident from human clinical trials that milk with A1 protein produces more hydrogen and symptoms of lactose intolerance. A pro-inflammatory μ-opioid peptide BCM-7 is released from A1 but not from A2. Milk containing A1 β-casein produced more inflammatory markers than A2 β-casein. This is a double-blinded, randomized, controlled trial conducted to determine if A1 beta-casein containing milk causes acute effects on inflammatory markers following a single milk feeding, as compared to milk containing only A2 beta-casein.
Read the detailed description
Recruitment:
Flyers, emails, and advertisements in local and university newspapers will be used for recruitment of study participants.
Phone screening:
Interested individuals will be contacted via phone by study staff to assess eligibility by asking questions listed in the inclusion and exclusion criteria.
Informed consent:
If the individual is eligible through phone screening, the study staff will read and explain the informed consent to the individual. Informed consent will contain all the information regarding study procedure, compensation, risks and benefits. If Informed Consent is granted, the participant will be contacted through their preferred method of contact (email or phone) to schedule a hydrogen breath test (HBT).
Screening lactose maldigesters via HBT:
Maldigestion will be classified by a rise of breath hydrogen concentration of greater than 20ppm after a challenge dose of 2% commercial milk containing 0.5g lactose per kg body weight. Participants will consume a low-fiber meal and then fast 12 hours prior to HBT. A breath sample will be obtained from participants just before drinking the milk dose. Participants will then consume milk containing 0.5 grams lactose per kilogram body weight. Breath samples will be obtained according to the following schedule: 0 hour (pre dose), 30 minutes, 1 hour, 90 minutes, 2 hours, 3 hours, 4 hours, 5 hours and 6 hours. Participants who exhibit a rise of breath hydrogen concentration of greater than 20ppm between any two timepoints of the 6-hour test will be classified as lactose maldigesters, and will be qualified to enter the intervention portion of the study.
Intervention:
There will be two in-person visits in intervention. The visits will be at least 6 days apart.
Visit 1:
Participants will consume a low-fiber dinner and fast for 12 hours prior to the visit. Participants will provide their first breath sample before consumption of milk. Participants will then consume a challenge dose of first randomized milk containing 0.5g lactose per kg body weight. Breath samples will be collected at 0 hour (pre dose), 30 minutes, 1 hour, 90 minutes, 2 hours, 3 hours, 4 hours, 5 hours and 6 hours. Participants will be asked to report and rate any symptoms including abdominal pain, bloating, flatulence, fecal urgency, and diarrhea they might experience during the 6 hour test.Blood will be drawn from participants at 0 hour (pre-dose), 1 hour , 2 hours and 3 hours time-point via catheter and serum will be isolated from whole blood for analyses of markers including hs-CRP, IgG, IgG1, Il-4, GSH and BCM-7.
Visit 2:
There will be at least a 6-day interval between Visit 1 and Visit 2. The same procedure from visit 1 will be followed in visit 2. Participants will consume the second randomized milk containing 0.5 grams lactose per kilogram body weight during this visit.
- Conditions
- Lactose Intolerance
- Being tested
- Milk containing A1 and A2 beta-casein, Milk containing only A2 beta-casein
- Medical subject headings
- Lactose Intolerance
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Milk containing A1 and A2 beta-caseinOther
Also called Commercial milk
Single dose of milk
Milk containing only A2 beta-caseinOther
Also called A2 milk
Single dose of milk
What is being measured
The primary outcome is the main question the study is designed to answer.
Difference in inflammation between commercial and A2 milk
The concentration of inflammatory markers hs-CRP, IL-4, IgG, IgG1, BCM-7, GSH in serum will be measured using ELISA kits, Cobas 400 plus analyzer and a Cobas e411 analyzer in nanometers.
Measured: Within the 3 hours following milk dose
Difference in hydrogen between commercial and A2 milk
Hydrogen concentration (ppm) will be measured in breath sample using a hydrogen breath analyzer.
Measured: Within the 6 hours following milk dose
Difference in symptoms between commercial and A2 milk
Participants will record and rate abdominal pain, bloating, flatulence, diarrhea and fecal urgency using a 6-point Likert Scale during the 6-hour test. The scale ranges from a score of 0 to 5 (0 = none, 1 =slight, 2 = mild, 3 = moderate, 4 = moderately severe, 5 = severe).
Measured: Within the 6 hours following milk dose
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Dec 2022
- Study start18 Jan 2022
- Primary completionDec 2024 (estimated)
- Study completionAug 2025 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for Lactose IntoleranceStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 35 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Purdue University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Dennis A. Savaiano, Purdue University
- Investigators
- Dennis Savaiano, PhD, Principal investigator, Purdue University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05660278
- Sponsor's protocol ID
- IRB-2022-845
- Status last verified
- Dec 2022
- First submitted
- 7 Dec 2022
- Last updated
- 21 Dec 2022
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Jianqin S, Leiming X, Lu X, Yelland GW, Ni J, Clarke AJ. Effects of milk containing only A2 beta casein versus milk containing both A1 and A2 beta casein proteins on gastrointestinal physiology, symptoms of discomfort, and cognitive behavior of people with self-reported intolerance to traditional cows' milk. Nutr J. 2016 Apr 2;15:35. doi: 10.1186/s12937-016-0147-z.
PubMed 27039383Ramakrishnan M, Eaton TK, Sermet OM, Savaiano DA. Milk Containing A2 beta-Casein ONLY, as a Single Meal, Causes Fewer Symptoms of Lactose Intolerance than Milk Containing A1 and A2 beta-Caseins in Subjects with Lactose Maldigestion and Intolerance: A Randomized, Double-Blind, Crossover Trial. Nutrients. 2020 Dec 17;12(12):3855. doi: 10.3390/nu12123855.
PubMed 33348621Cieslinska A, Kostyra E, Kostyra H, Olenski K, Fiedorowicz E, Kaminski S. Milk from cows of different beta-casein genotypes as a source of beta-casomorphin-7. Int J Food Sci Nutr. 2012 Jun;63(4):426-30. doi: 10.3109/09637486.2011.634785. Epub 2011 Nov 14.
PubMed 22080615
Study at a glance
From the registry record, last updated by the sponsor on 21 Dec 2022. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparing the Acute Effects of A1 Containing Commercial Milk and A2 Milk on Inflammation, Lactose Intolerance and Lactose Maldigestion in Lactose Maldigesters
- ClinicalTrials.gov ID
- NCT05660278
- Acronym / sponsor ID
- IRB-2022-845
- Conditions
- Lactose Intolerance
- Study type
- Interventional
- Recruitment status
- Unknown status
- Enrolment
- 35 participants (estimated)
- Lead sponsor
- Purdue UniversityUniversity, hospital or other
- Study start
- 18 Jan 2022 (actual)
- Primary completion
- Dec 2024 (estimated)
- Study completion
- Aug 2025 (estimated)
- First posted
- 21 Dec 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Cow's milk contains two types of β-casein: A1 and A2. It is evident from human clinical trials that milk with A1 protein produces more hydrogen and symptoms of lactose intolerance. A pro-inflammatory μ-opioid peptide BCM-7 is released from A1 but not from A2. Milk containing A1 β-casein produced more inflammatory markers than A2 β-casein. This is a double-blinded, randomized, controlled trial conducted to determine if A1 beta-casein containing milk causes acute effects on inflammatory markers following a single milk feeding, as compared to milk containing only A2 beta-casein.
Detailed description
Recruitment:
Flyers, emails, and advertisements in local and university newspapers will be used for recruitment of study participants.
Phone screening:
Interested individuals will be contacted via phone by study staff to assess eligibility by asking questions listed in the inclusion and exclusion criteria.
Informed consent:
If the individual is eligible through phone screening, the study staff will read and explain the informed consent to the individual. Informed consent will contain all the information regarding study procedure, compensation, risks and benefits. If Informed Consent is granted, the participant will be contacted through their preferred method of contact (email or phone) to schedule a hydrogen breath test (HBT).
Screening lactose maldigesters via HBT:
Maldigestion will be classified by a rise of breath hydrogen concentration of greater than 20ppm after a challenge dose of 2% commercial milk containing 0.5g lactose per kg body weight. Participants will consume a low-fiber meal and then fast 12 hours prior to HBT. A breath sample will be obtained from participants just before drinking the milk dose. Participants will then consume milk containing 0.5 grams lactose per kilogram body weight. Breath samples will be obtained according to the following schedule: 0 hour (pre dose), 30 minutes, 1 hour, 90 minutes, 2 hours, 3 hours, 4 hours, 5 hours and 6 hours. Participants who exhibit a rise of breath hydrogen concentration of greater than 20ppm between any two timepoints of the 6-hour test will be classified as lactose maldigesters, and will be qualified to enter the intervention portion of the study.
Intervention:
There will be two in-person visits in intervention. The visits will be at least 6 days apart.
Visit 1:
Participants will consume a low-fiber dinner and fast for 12 hours prior to the visit. Participants will provide their first breath sample before consumption of milk. Participants will then consume a challenge dose of first randomized milk containing 0.5g lactose per kg body weight. Breath samples will be collected at 0 hour (pre dose), 30 minutes, 1 hour, 90 minutes, 2 hours, 3 hours, 4 hours, 5 hours and 6 hours. Participants will be asked to report and rate any symptoms including abdominal pain, bloating, flatulence, fecal urgency, and diarrhea they might experience during the 6 hour test.Blood will be drawn from participants at 0 hour (pre-dose), 1 hour , 2 hours and 3 hours time-point via catheter and serum will be isolated from whole blood for analyses of markers including hs-CRP, IgG, IgG1, Il-4, GSH and BCM-7.
Visit 2:
There will be at least a 6-day interval between Visit 1 and Visit 2. The same procedure from visit 1 will be followed in visit 2. Participants will consume the second randomized milk containing 0.5 grams lactose per kilogram body weight during this visit.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Triple blind (participant, investigator, outcomes assessor)
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (6 listed)
- • Ability/desire to provide informed consent
Key exclusion criteria (25 listed)
- • Allergic to milk
- o Weighing <16.5 kg and BMI > 35 kg/m2
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Milk containing A1 and A2 beta-caseinAlso: Commercial milkSingle dose of milk | Other | – |
| Milk containing only A2 beta-caseinAlso: A2 milkSingle dose of milk | Other | – |
Primary outcome
Difference in inflammation between commercial and A2 milk
Time frame: Within the 3 hours following milk dose
The concentration of inflammatory markers hs-CRP, IL-4, IgG, IgG1, BCM-7, GSH in serum will be measured using ELISA kits, Cobas 400 plus analyzer and a Cobas e411 analyzer in nanometers.
Difference in hydrogen between commercial and A2 milk
Time frame: Within the 6 hours following milk dose
Hydrogen concentration (ppm) will be measured in breath sample using a hydrogen breath analyzer.
Difference in symptoms between commercial and A2 milk
Time frame: Within the 6 hours following milk dose
Participants will record and rate abdominal pain, bloating, flatulence, diarrhea and fecal urgency using a 6-point Likert Scale during the 6-hour test. The scale ranges from a score of 0 to 5 (0 = none, 1 =slight, 2 = mild, 3 = moderate, 4 = moderately severe, 5 = severe).
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Dec 2022.
- Background: PubMed 27039383Jianqin S, Leiming X, Lu X, Yelland GW, Ni J, Clarke AJ. Effects of milk containing only A2 beta casein versus milk containing both A1 and A2 beta casein proteins on gastrointestinal physiology, symptoms of discomfort, and cognitive behavior of people with self-reported intolerance to traditional cows' milk. Nutr J. 2016 Apr 2;15:35. doi: 10.1186/s12937-016-0147-z.
- Background: PubMed 33348621Ramakrishnan M, Eaton TK, Sermet OM, Savaiano DA. Milk Containing A2 beta-Casein ONLY, as a Single Meal, Causes Fewer Symptoms of Lactose Intolerance than Milk Containing A1 and A2 beta-Caseins in Subjects with Lactose Maldigestion and Intolerance: A Randomized, Double-Blind, Crossover Trial. Nutrients. 2020 Dec 17;12(12):3855. doi: 10.3390/nu12123855.
- Background: PubMed 22080615Cieslinska A, Kostyra E, Kostyra H, Olenski K, Fiedorowicz E, Kaminski S. Milk from cows of different beta-casein genotypes as a source of beta-casomorphin-7. Int J Food Sci Nutr. 2012 Jun;63(4):426-30. doi: 10.3109/09637486.2011.634785. Epub 2011 Nov 14.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Tracy Eaton, MSW contact
Dennis Savaiano, PhD principal investigator
Purdue University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Milk containing A1 and A2 beta-casein and Milk containing only A2 beta-casein in people with Lactose Intolerance, run by Purdue University at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 25 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 21 Dec 2022. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
Contact Dennis Savaiano, PhD (494-8228 ext. 765, savaiano@purdue.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Difference in inflammation between commercial and A2 milk (time frame: Within the 3 hours following milk dose). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05660278, which also lists 3 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Dec 2022; AzTrials last refreshed its copy on 8 Nov 2026.