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Nitrosamines are carcinogenic agents which can unfavorably affect some male reproductive parameters. Humans are exposed to nitrosamines through various routes, the most important of which is the diet. Crocin is a carotenoid and is accountable for the red color of saffron. Crocin has numerous pharmacological actions, such as antioxidant roles and radical scavenging. The aim of this study was to evaluate the effects of Crocin against Nitrosamine - induced damage to the reproductive parameter of male rats. In this experimental study, 48 male rats were randomly assigned to 8 groups: control normal and Nitrosamine control groups (40 mg/kg); Crocin (12.5, 25, and 50 mg/kg) and Nitrosamine + Crocin (12.5, 25, and 50 mg/kg). Treatments were administered intraperitoneally and gavaged daily for 28 days. The sperm parameters, total antioxidant capacity, testosterone level, and seminiferous tube diameter were assessed. Nitrosamine significantly decreased sperm parameters (p<0.001). The Crocin and Crocin + Nitrosamine treatments at complete doses significantly improved all parameters (p<0.001). Crocin compensated for the toxic effect of Nitrosamine on reproductive parameters. [ABSTRACT FROM AUTHOR]