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Vitamin D Deficiency clinical trials recruiting in the U.S.

7 studies for Vitamin D Deficiency are recruiting participants at sites across the United States.

A lack of vitamin D (deficiency) can affect your bones and overall health. Learn who is at risk, how much vitamin D you need, and how to get enough.

Recently updated studies

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.