The definition and criteria for<unk>  are very difficult. Per a narrative review, "over 60 Mendelian randomization studies, designed to minimize bias from confounding, have evaluated the consequences of lifelong genetically lowered serum 25OHD concentrations on various outcomes and most studies have found null effects".
Vitamin D deficiency
Hypervitaminosis D
Tumor induced osteomalacia
Disorders of calcium metabolism
Copper deficiency
Secondary hyperparathyroidism
Secondary amyloidosis
Dystrophic calcification