Study Info - inVitD

Vitamin D helps the body absorb calcium. It helps build bones, and it keeps them strong and healthy. Vitamin D is also important in other body functions, such as with hormones and blood sugar control. Vitamin D is either taken orally or produced in the body from exposure to sunshine.

The role of vitamin D in reproduction is an exciting area of research. Low levels of vitamin D are common in the U.S., especially among women with darker skin tones.
- Low levels of vitamin D have been linked with a harder time getting pregnant.
- One study reported that lower levels of vitamin D were linked to irregular and/or longer menstrual cycles.
- Low levels of vitamin D were also shown to be linked to delayed ovulation (the releasing of eggs).
How or why vitamin D has these effects is unknown.

Participants will be asked to conduct various study tasks. Some of these tasks include:
- Attending three in-person visits at the Durham, NC NIEHS Clinic Research Unit (CRU).
- Filling out daily and weekly online diaries among other surveys about your menstrual cycle.
- Collecting daily urine samples.
- Collecting other body fluid samples.

NIEHS Clinical Research Unit (CRU)

Alexander Njunge
Field Staff

Brittany Mosley
Field Staff

Catherine-Wild
Field Staff

Cindy Smith
Field Staff

Stefanie Vidal
Field Staff

Heidi Rogers
Field Staff

Lashawn Ruffin
Field Staff

Xiomara Hodge
Field Staff