Abstract
Serum Zn was measured in 154 male and 95 female blood donors. Men had higher serum Zn levels than women, the difference being statistically significant (P < 0.001). The correlations between serum Zn and serum testosterone, serum Zn and serum FSH [follicle stimulating hormone] and serum Zn and serum LH [luteinizing hormone] were studied in 40 men aged 28-60 yr and a statistically significant positive correlation was found only between serum Zn and serum testosterone in men of age 36-60 yr (P < 0.005). These results do not support the theory that slight Zn deficiency primarily affects pituitary gonadotropins but indicate rather that it would act on the testicular level.

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