The majority of effects elicited by blood donation on blood donors were positive (i.e. feelings of satisfaction, greater alertness, increased wellbeing, etc.). The positive effects did not differ from the negative regarding time of onset, yet their duration was reported to be significantly longer. There was no association between frequency of occurrence of positive effects and the number of blood donations, indicating that there is no 'addictive' relationship between donors and blood donations. The findings in this study of high frequency of occurrence of positive long-lasting effects elicited in blood donors by blood donation may be of great importance for the recruitment of new blood donors as it may make blood donation less frightening and perhaps even attractive.