Vitamin D (Bio)Fortified Shopping Baskets to Improve Vitamin D Status
Enrolling by invitation · Not applicable
Conditions studied: Vitamin D Biofortification, Vitamin D Fortification, Vitamin D Status
In brief
Vitamin D is essential for healthy bones, muscles, and immune function. It comes from food, supplements, and sunlight. There are two main forms; vitamin D2, found mainly in plant foods, and vitamin D3, which comes from animal foods and is more effective at increasing vitamin D levels in the body. In the UK, sunlight is often too weak especially in winter for the body to make enough vitamin D, so people rely mainly on dietary sources and supplements. Despite this, many people in the UK have low vitamin D levels, and teenagers are particularly at risk due to increased needs during growth, with around one in five adolescents having low vitamin D levels. Poor intake of vitamin D-rich foods, low supplement use, and inconsistent food fortification contribute to this problem. This study aims to assess whether a family-based household diet using natural and fortified vitamin D foods during winter can improve vitamin D levels in adolescents.
Key facts
- Study ID
- NCT07349290
- Run by
- University of Ulster
- People needed
- 160
- Starts
- 2026-02-12
- Expected to finish
- 2027-04-01
- Last updated by the study team
- 2026-05-06
Who can join
Age: 4 and older. Sex: any. Healthy volunteers: accepted.
You may qualify if…
- Households with at least one adult member (≥18 years) and at least one adolescent member (11-17 years).
- Participants willing to consume the majority of study foods provided
- Participants willing to provide a total of two blood samples (maximum 25ml at each timepoint).
You may not qualify if…
- Any food allergies or intolerances, including anaphylaxis allergies
- Individuals taking/unwilling to stop taking high dose vitamin D supplements (1000 IU) for a washout period (4 weeks before) and for the duration of the study period
- Other major dietary exclusions, e.g. those following vegan or vegetarian lifestyles.
- Individuals with conditions causing malabsorption, e.g. coeliac disease
Where it is running
- Ulster University, Human Intervention Studies Unit, Coleraine, Co. Londonderry — Coleraine, United Kingdom
Full record on ClinicalTrials.gov
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