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Concerns about Monsanto’s herbicide, Roundup, are at an all-time high. But according to a new report by Earth Open Source, one of the biggest concerns may be something that you’re totally in the dark about, namely birth defects.

Research published last year shows that glyphosate, the active ingredient in Roundup, causes birth defects in frogs and chicken embryos at far lower levels than used in agricultural and garden applications.