The present invention can be used to manufacture cosmetic products for hand and/or body care, as well as household cleansers. The biologically active complex is designed for use in cosmetic products and/or household cleansers and is comprised of: a) tea tree essential oil ( Melaleuca alternifolia ); b) alpha-bisabolol; c) 1,8-cineol, derived from eucalyptus leaves Eucalyptus spp.; d) aqueous solution of citric acid and silver citrate, where the specified aqueous solution contains 19-23 weight % of citric acid and 2280-2640 parts per million of silver citrate; and where mass ratio of a:b:c:d components makes (0.1-0.5):(0.05-0.3):(0.05-0.35):(0.01-0.2), correspondingly. The quad complex can be used to regulate skin microbiota, including growth inhibition of opportunistic pathogen population, including bacteria, fungi, maintenance of the stable condition of residential microflora, expressed antibacterial effect on transitory microflora, degradation of opportunistic pathogen biofilms.