A Comparison of Capsules and Oral Spray Solution as Methods of Delivering Vitamin D3 and Raising Status

A Comparison of Capsules and Oral Spray Solution as Methods of Delivering Vitamin D3 and Raising Status: a Randomised Crossover Study

The aim of the study is to compare the effectiveness of a vitamin D3 oral spray solution with capsules at raising vitamin D status over winter.

This randomised crossover trial will aim to recruit a total of 22 healthy participants for a total of two 4-week interventions separated by a 10-week washout.

Inclusion Criteria:

• Apparently healthy
• Over the age of 18

Exclusion Criteria:

• Those that intend to consume a supplement containing vitamin D at any point during the study
• Those under the age of 18.
• Individuals that are on prescribed medication that is known to affect vitamin D metabolism
• Those following a vegan diet
• Sun-bed users
• Participants that are planning a sun holiday during the study