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25-Hydroxyvitamin D Concentration clinical trials

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NCT ID: NCT03035084 Recruiting - Clinical trials for Vitamin D Deficiency

Is Vitamin D2 Treatment-associated Decrease in 25(OH)D3 Level a Reciprocal Phenomena?

Start date: January 2017
Phase: Phase 4
Study type: Interventional

Several studies have demonstrated that D2 treatment is associated with a decrease in 25(OH)D3 level and therefore have proposed that D3 would be preferable in term of raising total 25(OH)D level. The investigators postulate that the D2 treatment-associated decrease in 25(OH)D3 level may be related to an increase in total 25(OH)D level rather than being specific to D2 treatment, and thus there would be a D3 treatment-associated decrease in 25(OH)D2 level. The investigators plan to conduct a double-blind placebo-controlled trial to examine the effect of D3 treatment on 25(OH)D2 level and the effect of D2 treatment on 25(OH)D3 leve