Twenty-five com. energy drinks were analyzed for contents of caffeine, sugar and sweeteners (aspartame, saccharin), B6, B8 and B12 vitamins and preservative (BzONa) by high performance liq. chromatog. Caffeine was identified in 23 drinks and its content was 0-37.16 mg/100 mL of drink. The sugars were detected in 20 samples, while aspartame and saccharin in 2 samples in concns. of 141.9 and 100.03 mu g/mL, resp. The concn. of BzONa was below the detection limit of the method used.