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Acute Vitamin D Supplementation on Testosterone in Females
Sponsor: University of Southern California
Summary
Participation will take place over two visits to the Clinical Exercise Research Center (CERC) at the University of Southern California Health Sciences Campus. On the first visit, height, weight, and body composition by bioelectrical impedance are recorded. Questionnaires and withdrawal of a sample of blood (1 tablespoon) are also completed. The intervention begins the day following the first visit. The intervention protocol consists of three weeks of consuming either a placebo capsule or a 5000 IU Vitamin D capsule daily and completing a daily survey. The second visit to CERC immediately follows the 3-weeks intervention. In this visit, the same blood sampling protocol will be completed. The assignment of the intervention will be randomized (i.e., rolling a die), and participants are blinded to group assignment.
Official title: Effects of Acute Vitamin D Supplementation on Testosterone in Young, Healthy Females: A Pilot Study
Key Details
Gender
FEMALE
Age Range
18 Years - 35 Years
Study Type
INTERVENTIONAL
Enrollment
20
Start Date
2025-07-01
Completion Date
2026-09-30
Last Updated
2026-03-25
Healthy Volunteers
Yes
Conditions
Interventions
Vitamin D (Cholecalciferol )
5000 IU Vitamin D (as cholecalciferol) capsules (Vitamin D3 125 mcg \[5,000 IU\], Pure Encapsulation, LLC) daily
Placebo Group
One placebo capsule (Zeebo Imagine, Zeebo) daily.
Locations (1)
University of Southern California Health Sciences Campus Center for Health Professions
Los Angeles, California, United States