Within this research, the effects of daily utilization of adequate quantity of re-hydration drink-apple and celery cocktail-on the endurance of welltrained athletes are determined. This drink contains up to 10% of carbohydrates (8.83%). The level of Ca is 130.52 mg/l, K-425.17 mg/l; Mg-25.15 mg/l; Na-48.16 mg/l and P-69.44 mg/l.

The medicinal plant common centaury (Centaurium umbellatum Gilib.) of the gentian family is highly valued in pharmacy for its favourable effect on problems of the digestive system. The aim of our research was to examine the contents of macro- and microelements in common centaury, honey, and a product based on honey and common centaury, so that common centaury can be more widely used together with honey as a food supplement.