Boric acid and sodium borates have been considered as being "toxic to reproduction and development", following results of animal studies with high doses. However unfavorable effects of boron exposure on reproduction and development have not been proved in epidemiological studies so far. The aim of the present study was to investigate the reproductive toxicity indicators in highly exposed workers employed in a boric acid production plant in Bandirma, Turkey. Two hundred and four workers participated in this study. The mean blood boron concentration of the high exposure group of workers was 223.89 +/- 69.49 (152.82-454.02) ng/g. Unfavorable effects of boron exposure on the reproductive toxicity indicators were not observed. (C) 2012 Elsevier GmbH. All rights reserved.