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Clinical Studies


  • Vitamin D-Sulfates in Breastmilk Rochester, Minn.

    The purpose of this study is to measure vitamin D sulfates in freshly expressed breastmilk samples and identify correlations with serum vitamin D status.

    Knowledge obtained from these measurements could suggest alternative approaches to improving vitamin D intake for infants.       

    Objective 2- Locate sulfatase activity in infant saliva and digesta to determine nutritional value of vitamin D sulfates for the infant.

Closed for Enrollment

  • Comparison of Outcomes Between Two Models of Advanced Practice Provider (APP) Roles in Primary Care Rochester, Minn.

    Is a greater care team NP/PA to MD/DO ratio associated with reduced cost and improved access and continuity within the care team?

  • Maternal Oral Vitamin D Supplementation Via Daily or Monthly Regimens and the Effect on Levels of Vitamin D in Human Milk and Infant Serum Rochester, Minn.

    Adequate vitamin D is essential for proper infant growth and development. However, human milk is low in vitamin D, and most infants do not receive recommended supplementation. Our aim is to assess the feasibility of providing adequate vitamin D to breastfed infants through maternal vitamin D supplementation. Forty non-pregnant, lactating women at least 18 years of age with exclusively breastfed infants between the ages of 1 and 6 months will be randomized to receive oral vitamin D as either 5,000 IU daily for 28 days or 150,000 IU as a single dose. Maternal serum calcium, phosphorus, vitamin D and 25(OH)D; maternal urinary calcium; maternal milk vitamin D and 25(OH)D will be measured on days 0, 1, 3, 7, 14, and 28 of the study; and infant serum vitamin D and 25(OH)D will be measured on days 0 and 28.