Research conducted by Mesnard et al, published in the journal Toxicology, found that the additives to glyphosate-based herbicides are themselves toxic to human cells.

Pesticides typically consist of an active ingredient, such as glyphosate in Roundup, and additives, or “adjuvants”.  Since the adjuvants themselves can be toxic, it is necessary to assess the entire pesticide formulation as a mixtures.  According to the researchers, the pesticide formulation is more toxic than glyphosate alone.