Surfactant adjuvants that are expected to further improve the bioefficacy of herbicides. The surfactant adjuvant comprises an amine-based surfactant, and a sulfosuccinate or sulfosuccinamate-based surfactant. The surfactant adjuvant of the present invention combines the known surfactancy, or wetting characteristics, of sulfosuccinate or sulfosuccinamate-based surfactants, with the proven bioefficacy characteristics of alkoxylated amine-based surfactants. The present invention also provides for herbicide compositions that contain the surfactant adjuvants of the present invention. The herbicide compositions comprise a herbicide active ingredient, a surfactant adjuvant of the present invention, and optionally, one or more formulation aids. The herbicide compositions of the present invention are expected to have a reduced tendency to cause eye and skin irritation. The present invention additionally provides for a method of controlling unwanted weeds or vegetation using the herbicide compositions of the present invention.