Moderate Versus High Dose Vitamin D for Prevention of COVID-19

The purpose of this study is to understand whether taking vitamin D can help prevent COVID-19 (the disease caused by the novel coronavirus). We will also study whether taking vitamin D can prevent people who do catch the virus from getting as sick from it.

In order to participate you must meet the following criteria:

• Are 18 years of age or older.
• Live or work in the Chicagoland area (Illinois counties: Cook, Lake, McHenry, DuPage, Kane, Kendall, Grundy, Will, and Kankakee; Indiana counties: Lake and Porter). 
• Are interested in vitamin D as a potential preventive measure against COVID-19 in which they self-administer a daily dose of vitamin D during the 9-month study period.
• Are willing to attend the laboratory for drop-in appointments at Rush University Medical Center every 3 months at 4 time points over a 9-month period for blood draws measuring COVID-19 antibodies, calcium, vitamin D and PTH levels.
• Are willing to complete self-report measures at 4 time points over the course of 9 months by completing a 15-minute survey at intake by telephone or via web and 10-minute web-based follow-up surveys.

You will be excluded from the study if any of the following criteria apply to you:

• Report ever having a positive COVID-19 PCR test result
• Report being pregnant, planning to become pregnant, and/or report breastfeeding during the study period.
• Report a history of chronic kidney disease, including a history of abnormal GFR and/or creatinine.

This is a partial list of eligibility requirements. To inquire about your eligibility, please call the contact number provided. If you wish to inquire via email, please include the title of the study in your message.