['Up to now, the measurement of carbohydrate-deficient transferrin (CDT) has been used in persons with a regular alcohol consumption of >60 g/day; primarily due to aspects of insurance medicine, as its levels have an informative value even at 2 to 3 weeks after the discontinuation of consumption.', 'In the literature concerning % CDT levels in individuals who used chemicals, medical drugs, food supplements and muscle-tissue increasing drugs there is scarce information, therefore these cases in this paper deserve interest.', 'The authors demonstrate the history and laboratory results of three cases. All of them were ethanol abstinent and they had used protein-containing food supplements for one or two months. The measurement of the % CDT showed elevated values.'] Is [ The level of carbohydrate-deficient transferrin highly increased in bodybuilders ]?