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Vitamin Deficiencies and Supplementation in Morbidly obese

The main objective is to optimize the supplementation of vitamins and minerals to prevent postoperative deficiencies after MB / RYGB or GS on the long term. We also examined whether the number of outpatient visits, blood tests, and costs can be…

Prevention of depression and poor physical function in older persons with vitamin D supplementation

Primary objectives: 1. Does vitamin D supplementation improve depressive symptoms in older persons? 2. Does vitamin D supplementation improve physical performance and functional limitations in older persons?Secondary objectives: 3. Does vitamin D…

The effect of vitamin D supplementation on vitaminD levels in patients with severe mental illness - a prospective trial

The main objective of this study is to investigate if 800 IU or 1600 IU vitamin D is needed to reach adequate levels of vitamin D after 3 months of treatment in at least 80% of the patients with severe mental illness (patients with SMI) between 18…

Efficacy of a predefined vitamin D dosing regimen in vitamin D-insufficient multiple myeloma patients.

The primary objective of this study is to determine the efficacy of a predefined vitamin D dosing regimen on the prevalence of vitamin D insufficiency in MM patients. Secondary objectives are to detect the influence of several variables (age, gender…

Placebo-controlled double-blind randomized controlled trial investigating vitamin K supplementation on vascular calcification propensity in vitamin K deficient renal transplant recipients

To study the effect of vitamin K supplementation on calcification propensity and vitamin K status in RTRs with vitamin K deficiency.