A shampoo composition useful for improving the appearance of the scalp showing symptoms of dandruff, wherein said composition comprises: a) from 0.1% to 5% by weight of the zinc pyrithione composition； b) from 0.01% to 5% by weight of the composition of a metal ion source selected from the group consisting of zinc acetate, zinc oxide, zinc carbonate, zinc hydroxide, zinc chloride, sulfate zinc, zinc citrate, zinc fluoride, zinc iodide, zinc lactate, zinc oleate, zinc oxalate, zinc phosphate, zinc propionate, zinc salicylate, zinc selenate, zinc silicate, zinc stearate, zinc sulphide, zinc tanate, zinc tartrate, zinc valerate, zinc gluconate, zinc undecylate, disodium copper citrate, copper triethanolamine, copper carbonate, ammonium cuprous carbonate, cupric hydroxide, copper chloride, cupric chloride , ethylene diamine copper complex, copper oxychloride, copper oxychloride sulfate, cuprous oxide, copper thiocyanate, and mixtures thereof； c) a topical vehicle for said zinc pyrithione and said metal ion source； and d) a detersive surfactant； wherein the weight ratio of the metal ion source to the antimicrobial active substance is 5: 100 to 5: 1 and where at least 50% of the zinc pyrithione is insoluble in the composition； and wherein the composition comprises, as b), from 0.01% to 5% by weight of the zinc carbonate composition.Una composición de champú útil para mejorar el aspecto del cuero cabelludo que presenta síntomas de caspa, en donde dicha composición comprende: a) de 0,1 % a 5 % en peso de la composición de piritiona de cinc； b) de 0,01 % a 5 % en peso de la composición de una fuente de ion de metal seleccionada del grupo que consiste en acetato de cinc, óxido de cinc, carbonato de cinc, hidróxido de cinc, cloruro de cinc, sulfato de cinc, citrato de cinc, fluoruro de cinc, yoduro de cinc, lactato de cinc, oleato de cinc, oxalato de cinc, fosfato de cinc, propionato de cinc, salicilato de cinc, selenato de cinc, silicato de cinc, estearato de cinc, sulfuro de
