Nowadays, an important challenge concerning the deleterious effects of pesticides in occupationally exposed agricultural workers is the high prevalence of reproductive dysfunctions observed in this population [23], [24], [25] and [26]. Glyphosate is supposed to be specific on plant metabolism; however, side effects in animals and humans have been claimed. In this context, glyphosate might act as an endocrine disruptor affecting the male reproductive system, because it can lead to alterations in aromatase activity and expression [8], estrogen-regulated genes [27], and testosterone levels [10] and [16]. Moreover, Roundup, the commercial formulation of glyphosate, disrupts spermatogenesis and causes loss of fertility, reinforcing its toxicity to testicular cells. Also, in the MA-10 Leydig tumor cell line, Roundup inhibits steroidogenesis by disrupting the expression of the StAR proteins [12]. In addition, Dallegrave and colleagues [28] have demonstrated that glyphosate–Roundup exposure during pregnancy and lactation did not induce maternal toxicity in Wistar rats, but induced adverse reproductive effects in male offspring rats, including decreased daily sperm production during adulthood, increased percentage of abnormal sperms, and decreased testosterone serum level at puberty. Conversely, the authors observe only a vaginal canal-opening delay in exposed female offspring. Taken together, these data strongly suggest Roundup as an endocrine disruptor affecting mainly male reproduction. However, the precise mechanisms underlying the effects of this pesticide on male reproductive tissue remain unclear. Although long-term toxicity of Roundup to animal tissues has been largely described [29], acute exposure to this pesticide is claimed to be toxic to fish [30]. Nevertheless, little information is available on the acute toxicity of low doses of Roundup to mammalian tissues, especially to the reproductive human male system.