A method comprising the steps of: (i) providing an emulsion of: a) an aqueous solvent, b) a carrier material soluble in (a), said carrier material being solid at ambient temperature, c) a volatile second liquid phase which is not miscible with (a), and d) a material which is soluble in (c) but not in (a), and, (ii) spray-drying the emulsion at above 100 Celsius to simultaneously remove (a) and (c) and thereby obtain a powder, in which the carrier material (b) has material (d) dispersed therein, said dispersion of (d) being a nano-scale dispersion, wherein the carrier material (b) is a polymer and/or a surfactant, wherein the polymer is a water-soluble polymer selected from the group consisting of: natural polymers; cellulose derivatives; homopolymers of any one of, or copolymers prepared from two or more of, the following monomers: vinyl alcohol, acrylic acid, methacrylic acid, acrylamide, methacrylamide, acrylamide methylpropane sulphonates, aminoalkylacrylates, aminoalkylmethacrylates, hydroxyethylacrylate, hydroxyethylmethylacrylate, vinyl pyrrolidone, vinyl imidazole, vinyl amines, vinyl pyridine, ethyleneglycol and other alkylene glycols, ethylene oxide and other alkylene oxides, ethyleneimine, styrenesulphonates, ethyleneglycolacrylates, ethyleneglycol methacrylate; and mixtures thereof, wherein the surfactant is non-ionic and/or anionic, wherein the non-ionic surfactant is selected from the group consisting of: ethoxylated triglycerides, fatty alcohol ethoxylates, alkylphenol ethoxylates, fatty acid ethoxylates, fatty amide ethoxylates, fatty amine ethoxylates, sorbitan alkanoates, ethylated sorbitan alkanoates, alkyl ethoxylates, PluronicsTM, alkyl polyglucosides, stearol ethoxylates, alkyl polyglycosides, and mixtures thereof, and wherein the anionic surfactant is selected from the group consisting of: alkylether sulfates, alkylether carboxylates, alkylbenzene sulfonates, alkylether phosphates, dialkyl sulfosuccinates, alkyl sulfonates, soaps, alkyl sulfates, alkyl carboxylates, alkyl phosphates, paraffin sulfonates, secondary n-alkane sulfonates, alpha-olefin sulfonates, isethionate sulfonates, and mixtures thereof. (i) providing an emulsion of: a) an aqueous solvent, b) a carrier material soluble in (a), said carrier material being solid at ambient temperature, c) a volatile second liquid phase which is not miscible with (a), and d) a material which is soluble in (c) but not in (a), and, a) an aqueous solvent, b) a carrier material soluble in (a), said carrier material being solid at ambient temperature, c) a volatile second liquid phase which is not miscible with (a), and d) a material which is soluble in (c) but not in (a), and, (ii) spray-drying the emulsion at above 100 Celsius to simultaneously remove (a) and (c) and thereby obtain a powder, in which the carrier material (b) has material (d) dispersed therein, said dispersion of (d) being a nano-scale dispersion, natural polymers; cellulose derivatives; homopolymers of any one of, or copolymers prepared from two or more of, the following monomers: vinyl alcohol, acrylic acid, methacrylic acid, acrylamide, methacrylamide, acrylamide methylpropane sulphonates, aminoalkylacrylates, aminoalkylmethacrylates, hydroxyethylacrylate, hydroxyethylmethylacrylate, vinyl pyrrolidone, vinyl imidazole, vinyl amines, vinyl pyridine, ethyleneglycol and other alkylene glycols, ethylene oxide and other alkylene oxides, ethyleneimine, styrenesulphonates, ethyleneglycolacrylates, ethyleneglycol methacrylate; and mixtures thereof, ethoxylated triglycerides, fatty alcohol ethoxylates, alkylphenol ethoxylates, fatty acid ethoxylates, fatty amide ethoxylates, fatty amine ethoxylates, sorbitan alkanoates, ethylated sorbitan alkanoates, alkyl ethoxylates, PluronicsTM, alkyl polyglucosides, stearol ethoxylates, alkyl polyglycosides, and mixtures thereof, and alkylether sulfates, alkylether carboxylates, alkylbenzene sulfonates, alkylether phosphates, dialkyl sulfosuccinates, alkyl sulfonates, soaps, alkyl sulfates, alkyl carboxylates, alkyl phosphates, paraffin sulfonates, secondary n-alkane sulfonates, alpha-olefin sulfonates, isethionate sulfonates, and mixtures thereof.