Introduction. Due to the large role of vitamin D in the prevention of many diseases, a study on the conscious supplementation of this vitamin among adolescents was conducted. Aim. The aim of the study was to examine the knowledge of high school youth about dietary supplements, specifically vitamin D supplementation. Material and methods. To carry out the task, the diagnostic survey method was applied, using a survey developed by the authors. Results. Most interviewees do not know the differences between dietary supplements and medicines. The surveyed youth are characterized by low awareness of vitamin D supplementation guidelines. Conclusion. There is a need for health education among high school students of the Podkarpackie Voivodeship on vitamin D supplementation with special attention to the differences between supplements and drugs containing this substance.

Key words: vitamin D, dietary supplement, youth.