Current Studies

An online form is available to contact the coordinators of each study listed below.

Flavanol MX Study - Men needed for a Research Study

UC Davis Nutrition Researchers are conducting a study that examines how dietary flavanols and flavones circulate in the body.

To qualify for this study you must be:

  • Male
  • 25-60 years of age
  • Not on medications
  • Not on supplements (multi-vitamin OK)

Participants will be asked to:

  • Participate in 3 visits
  • Consume flavanol containing test products
  • Follow a low-flavanol and flavone diet prior to and during each study visit
  • Provide urine and blood samples

Participants will receive:

  • $210 in compensation per study visit

Study Location:

  • Ragle Human Nutrition Research Center, Academic Surge II, UC Davis

For more information: call (530) 219-8199 or use the online form to contact a study coordinator.

Protein for Kids Study

Parents! We Are Looking For Children Who Are Willing to Participate in a Nutrition Research Study

We want to learn how a new nutritious food product will affect metabolism and cardiovascular health in children.

This vegetarian food product provides protein from pea, and is fortified with vitamins and minerals. We are encouraging that children replace their typical snack with this food.

We are looking for children who will be willing to eat about half a cup of this food product every day for 4 weeks. And we are asking that parents/guardians bring their children to either the UC Davis Medical Center or the UC Davis campus for a screening visit and 3 study visits each lasting about 2-3 hours.

We will be measuring blood flow in your child’s fingertip using a special finger probe, and we will be asking for a blood and urine sample for 2 of the study visits. We will also provide your child with nutrition education, and will ask them to wear a personal physical activity monitor.

You and your child together will receive up to $285.

If your child is 9- 13 years old and weighs at least 70 lbs, please call to see if your child qualifies. We will ask you questions about your child’s overall health.

If interested, please contact the Keen Lab at (530) 752-2915 or use the online form to contact a study coordinator.

Strawberry Study - Men and Postmenopausal Women needed for a Research Study

We are looking for interested participants to volunteer to participate in a 14 week research study that will examine the effects of daily strawberry powder intake on markers of gut and cardiovascular health.

To qualify for this study you must be:
  • 40-65 years of age
  • Overweight or Obese
  • Be willing to come in for 7 study visits, lasting about 2 hours each
  • Be willing to provide blood, urine and stool samples
  • Not taking any medications, and are willing to stop all supplement use prior to and throughout the study period.

Participants will receive:

  • Participants will receive $545 for completion of all study visits

Study Location:

  • Ragle Human Nutrition Research Center, Academic Surge, UC Davis


For more information: call (530) 752-2915 or use the online form to contact a study coordinator.


CabernayZyns Study - Postmenopausal Women needed for a Research Study

Scientists at UC Davis’ Department of Nutrition are conducting a study that examines the effects of consuming raisins made from cabernet grapes on vascular health.

To participate in this research study, you must be willing to come in for 2 study visits over a period of 2-3 weeks (each study visit will last about 3-4 hours); and be willing to consume 3.2 oz of raisins during the visit.


To qualify for this study you must be:

  • Female: 50-70 years of age
  • Overweight or Obese
  • Not taking any medications, and are willing to stop all supplement use prior to and throughout the study period.

Participants will receive:

  • You will receive up to $180 as compensation for your time

Study Location:

  • Ragle Human Nutrition Research Center, Academic Surge, UC Davis

For more information: call (530) 752-2915 or use the online form to contact a study coordinator.

Mango Study - Postmenopausal Women needed for a Research Study

Scientists at UC Davis’ Department of Nutrition are conducting a study that examines the effects of daily mango intake on vascular health.

To participate in this research study, you must be willing to come in for 3 study visits over a period of 4-6 weeks (each study visit will last about 3-4 hours); and be willing to consume 2 cups of mango every day for 2 weeks.


To qualify for this study you must be:

  • 50-70 years of age
  • In good health
  • Overweight or obese
  • Not taking any blood pressure of cholesterol medications.

Participants will receive:

  • You will receive up to $260 as compensation for your time

Study Location:

  • Ragle Human Nutrition Research Center, Academic Surge, UC Davis

For more information: call (530) 752-2915 or use the online form to contact a study coordinator.



Dried Plum Study - Postmenopausal Women needed for a Research Study

Scientists at UC Davis’ Department of Nutrition are conducting a study that examines the effects of daily dried plum intake on bone and vascular health.

To participate in this research study, you must be willing to come in for 5 study visits over a period of 6-8 weeks; and be willing to consume 2 and 6 dried plums every day for 2 weeks (for a total of 4 weeks).

To qualify for this study you must be:

  • Female
  • Postmenopausal
  • 50-70 years of age
  • In good health
  • Not taking any medications, and are willing to stop all supplement use prior to and throughout the study period

Participants will receive:

  • Participants will receive $205 as compensation for your time.

Study Location:

  • Ragle Human Nutrition Research Center, Academic Surge, UC Davis

For more information: call (530) 752-2915 or use the online form to contact a study coordinator.



Metabolic Effects of Sugar/Aspartame Study (MESA Study)

People are consuming a lot of sugar

Scientists at the University of California, Davis are conducting a research study to determine the effects that drinking sweetened beverages with provided study meals each day has on a person's metabolism.

We need healthy men and women, ages 18-40, who:

  • Are willing to consume the breakfast, lunch, and dinner provided by the study staff each day for approximately 42 days.
  • Are willing to drink 3 sweetened beverages per day for approximately 56 days along with the provided study meals.
  • Are non-smokers and not taking thyroid, lipid-lowering, diabetes, depression or blood pressure medications.
  • Are willing to spend two sessions (6 hours each) at the Ragle Research Facility at the UC Davis days or 30 hours each) at the Touro University Translational Clinic campus, and two sessions (1 1/4 days in Vallejo, CA (transportation provided by staff)
  • Have extra time to devote to helping us answer this important question.

Participation in this study requires a significant time commitment:

  • The entire study lasts approximately 70 days.
  • You will need to spend time at our research facilities:
    • Ragle Research Facility at the UC Davis campus located in Davis, CA.
      • For 6 hours at the beginning of the study
      • For 6 hours at the middle of the study
    • Touro University Translational Clinic (TUTC) in Vallejo, CA (transport provided by staff).
      • For 1 1/4 days (30 hours) during the 2nd week of the study
      • For 1 1/4 days (30 hours) during the 6th week of the study
  • You will be compensated approximately $1,170 for completing the study. There will be no compensation for participation in screening or consenting procedures.

Forms