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Effects of GLP-1 RAs on Human Lactation Outcomes
Sponsor: University of Colorado, Denver
Summary
There is increasing interest in using GLP-1 Receptor Agonist (GLP-1 RA) medications after pregnancy. This study is designed to determine if these medications affect breastmilk production or the nutritional makeup of breastmilk. The main questions the study will address are: * Does GLP-1 RA-induced weight loss increase or decrease breastmilk production? * Does GLP-1 RA-induced weight loss affect the nutritional composition of milk, including milk fat content? Researchers will assess milk production rates before and after mothers begin taking injected GLP-1 RA medications to decrease their body weight. Weight loss will be confirmed with 7-day body weight averages. Participants will: * Weigh themselves and report measurements daily. * Participate in 2-3 morning study visits over approx. 2.5-4.5 months (approx. 3-3.5hrs each). During each visit, participants will: * Use a study provided breastpump to express milk 3 times hourly for measurement of hourly milk production. * Provide 1-3 oz of milk for further study. * Answer questions about breastfeeding patterns.
Key Details
Gender
FEMALE
Age Range
Any - Any
Study Type
OBSERVATIONAL
Enrollment
18
Start Date
2026-07
Completion Date
2028-06
Last Updated
2026-07-22
Healthy Volunteers
Yes
Conditions
Interventions
Injected GLP-1 Receptor Agonists and Dual Agonists
Participants are prescribed this medication by their care provider(s) as part of their postnatal clinical care, including but not limited to semaglutide and tirzepatide. The investigators do not provide, manage, or assign the medication.
Locations (1)
University of Colorado Anschutz School of Medicine
Aurora, Colorado, United States