MILK Study

Study Type

General Health & Wellbeing

Study Purpose

Do you enjoy milk but sometimes experience mild to moderate digestive discomfort after drinking it?

Ordinary cows' milk contains a mix of both proteins known as A1 and A2 proteins. Research has found that the A1 protein in ordinary cows' milk might cause discomfort for some of us.

The MILK research study will explore whether problems sometimes associated with drinking milk are caused by one of these two proteins.

About the Study

The study will compare 2 weeks of drinking milk containing both A1 and A2 proteins, versus 2 weeks of drinking milk containing only the A2 protein.

Study Design

Number of Visits:

  • 13 study visits (1 screening visit + 12 study visits at Pennington Biomedical)


  • Physical examination (with vital signs)
  • Electrocardiogram or ECG test (heart health)
  • Smart Pill (A pill to measure the inner working of the intestines.)
  • Blood tests
  • Questionnaires

Study Qualifications

To qualify for the MILK research study, participants should:

  • Be 18 – 68 years of age
  • Be a current or past milk drinker
  • Have experienced mild to moderate digestive discomfort after drinking milk
  • Agree not to consume other dairy products during the study
  • Not have any current gastrointestinal disorders or diseases
  • Be able to tolerate swallowing pills

Study Duration

Participation in this research study will last approximately 10 weeks.


Compensation of up to $500 is offered for the completion of this study.

Study Contact

If you are interested in volunteering for the MILK research study, click here to screen online, call 225-763-3000 or email

If you think you may be eligible, please click the button below to screen online.


Please do not fill out this questionnaire for anyone other than yourself unless you are their legal guardian.
If you know someone who may be interested please direct them to the site or have them call us directly at 225-763-3000.


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