EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP). Scientific Opinion on the safety and efficacy of vitamin K3 (menadione sodium bisulphite and menadione nicotinamide bisulphite) as a feed additive for all animal species.. EFSA Journal. January 2014, 12 (1): 3532. doi:10.2903/j.efsa.2014.3532.