The purpose of this review is study of literature for the development of biological effect of Kalcipherol (D vitamin group) on children population. Different factors seem, that D- vitamin deficiency disbalance elevated, children specifically negative effect, which have a major impact on health, growth and development of infants, children and adolescents. Vitamin D and calcium deficiencies are preventable global public health problems in pediatric medicine. The laboratory assessment of vitamin D (calcidiol-25(OH)D), epidemiological studies assessing the prevalence of vitamin D deficiency, are performed to analyze the relationships between neuropsychological function and mechanisms of toxic effects in the setting of vitamin D.