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Is Monsanto's RoundUp Destroying Male Testosterone?

For related articles and more information, please visit OCA's Genetic Engineering page, Millions Against Monsanto page, and our Health Issues page.
In a disturbing study published last month (Dec. 2011) in the Journal of Toxicology in Vitro, researchers found that Monsanto's popular "weed killer" known as Roundup, which has already been linked to over 25 adverse health effects, is also capable of interfering with and/or harming the male reproductive system.

Researchers tested Roundup, a glyphosate-based herbicide, on mature rat testicular cells at a concentration range between 1 and 10,000 ppm, which they described as "the range in some human urine and in environment to agricultural levels." They found that within 1 to 48 hours of Roundup exposure testicular (Leydig) cells were damaged or killed.

What is more disturbing is that even at a lower, presumably "non toxic" concentration of 1 ppm of Roundup, or glyphosate by itself, testosterone concentrations were observed to decrease by 35%.

Keep in mind that 1 ppm of Roundup is an infinitesimal concentration. Distilled water, as a reference point, contains between 5-10 ppm of dissolved solids. How can such a small concentration of Roundup/glyphosate cause such a profound disruption of biological activity in testicular cells? The phenomenon is known as endocrine disruption.