In this study, reproducibility of the cosmetic purpose antimicrobial emulsion formulations containing collagen hydrolysate by taking the advantage of the antimicrobial features of the industrial essential oil plants including Thymus vulgaris, Origanum onites, Eucalyptus globulus and Mentha piperita was investigated. The formulations produced for this purpose were subjected to the microbiologic testings with respect to the disc diffusion method. As the result of the studies, the formulations containing 0. onites and T. vulgaris were found to demonstrate the highest antimicrobial activity. In addition to this, the emulsions were subjected to the viscosity and particle size analysis and examined in organoleptic terms as well. (C) 2012 Elsevier B.V. All rights reserved.