The aim of this study was to assess the usefulness of administering food supplements to male weightlifters (n = 13), members of the Polish National team, while on a training camp. The intakes of energy, protein, fat, carbohydrates, selected minerals (Ca, P, Mg, Fe, K, Zn, Cu) and vitamins (A, C, E, B₁, B₂, B₆, B₁₂ and niacin) were assessed from 24 h dietary recalls for the preceding day. The data concerning energy and selected nutrients in the diets was calculated from the current “Food Composition Tables” and in case of food supplements – from compositions declared by manufacturers; these were related to the official Polish norms of the estimated average requirements (EAR) and special recommendations for athletes. The results of the study indicated insufficient intakes of energy, proteins and carbohydrates (80,3; 83,0 and 60,4%, respectively) and inadequate proportions of macronutrient energy sources. The administered food supplements compensated for insufficient supplies of energy and food components and for inappropriate proportions of energy sources. The intakes of selected vitamins and minerals in diets without supplementation were adequate, for with the exception of potassium. Thus, the application of food supplements proved to be unnecessary except for the latter component. In case of magnesium supplementation exceed tolerable upper intake level (UL).