Use of at least one emulsifier system comprising organomodified siloxane block copolymers obtainable by A) addition reaction of organopolysiloxanes of the general formula I in which R 1 are identical or different aliphatic or aromatic hydrocarbon radicals having 1 to 20 carbon atoms, R 2 is R 1 or H, with the proviso that at least three radicals R 2 are H, a is 5 to 500, b is 1 to 50, c is 0 to 5, onto siloxanes of the general formula II containing double bonds where d is 10 to 1000 and R 3, independently of one another, are identical or different hydrocarbon radicals having 2 to 12 carbon atoms and containing at least one double bond, in the presence of platinum or rhodium catalysts, with the proviso that the organopolysiloxanes of the general formula I are present in at least 6-fold molar excess, based on the siloxane of the general formula II containing double bonds, to give a reaction product having Si-H groups and with further reaction of the reaction product in at least one of the stages B) transition-metal-catalysed partial or complete addition of the SiH groups onto alkenyl and/or alkynyl compounds, or C) partial or complete reaction of the Si-H groups remaining after the above reaction(s) in the presence of a catalyst with at least one alcohol, from the group of linear or branched, saturated, mono- or polyunsaturated, aromatic, aliphatic-aromatic, optionally halogen-atom-containing monoalcohols, polyether monoalcohols, polyester monoalcohols, amino alcohols, as emulsifier or as dispersion auxiliary in cosmetic, dermatological or pharmaceutical formulations. A) addition reaction of organopolysiloxanes of the general formula I in which R 1 are identical or different aliphatic or aromatic hydrocarbon radicals having 1 to 20 carbon atoms, R 2 is R 1 or H, with the proviso that at least three radicals R 2 are H, a is 5 to 500, b is 1 to 50, c is 0 to 5, onto siloxanes of the general formula II containing double bonds where d is 10 to 1000 and R 3, independently of one another, are identical or different hydrocarbon radicals having 2 to 12 carbon atoms and containing at least one double bond, in the presence of platinum or rhodium catalysts, with the proviso that the organopolysiloxanes of the general formula I are present in at least 6-fold molar excess, based on the siloxane of the general formula II containing double bonds, to give a reaction product having Si-H groups and with further reaction of the reaction product in at least one of the stages R 1 are identical or different aliphatic or aromatic hydrocarbon radicals having 1 to 20 carbon atoms, R 2 is R 1 or H, with the proviso that at least three radicals R 2 are H, a is 5 to 500, b is 1 to 50, c is 0 to 5, B) transition-metal-catalysed partial or complete addition of the SiH groups onto alkenyl and/or alkynyl compounds, or C) partial or complete reaction of the Si-H groups remaining after the above reaction(s) in the presence of a catalyst with at least one alcohol, from the group of linear or branched, saturated, mono- or polyunsaturated, aromatic, aliphatic-aromatic, optionally halogen-atom-containing monoalcohols, polyether monoalcohols, polyester monoalcohols, amino alcohols, as emulsifier or as dispersion auxiliary in cosmetic, dermatological or pharmaceutical formulations.