Fig. 5

Effects of SiO₂-NPs and thymol on serum reproductive hormone levels in male rats.
(A) Testosterone concentration (ng/ml). (B) Luteinizing hormone (LH) levels (mIU/ml). (C) Follicle-stimulating hormone (FSH) levels (mIU/ml). Data are presented as mean ± SEM (n = 6). Bars with different superscript letters (a–c) indicate statistically significant differences between groups (p < 0.05).