A method for the preparation of a stable nanosuspension comprising at least one natural material, wherein the method comprises the steps of a. Providing at least one natural material having a particle size (D 100) of less than 320 μm, other than an extract; b. Dispersing said at least one natural material of step a. in a solvent; c. Milling the dispersion of step b. to a particle size (D 90) of below 1000 nm (D 90 < 1000 nm), wherein the at least one natural material is dispersed in step b. in a concentration of from 0.5 to 20 % (w/w), based on the total amount of solvent used in the nanosuspension, and wherein the dispersing step b. or the milling step c. comprises the addition of a stabilizer; wherein the stabilizer is selected from the group consisting of phospholipids; polysorbates; hydroxypropyl cellulose, hydroxypropyl methylcellulose (HPMC) and polyvinylpyrrolidone; nonionic tri-block copolymers; copolyvinylpyrrolidone; Caprylocapropyl polyoxyl-8 glycerides; Lauraoyl polyoxyl-32 glycerides; gelatin; lecithin (phosphatides); gum acacia; cholesterol; tragacanth; polyoxyethylene alkyl ethers; polyoxyethylene castor oil derivatives; polyoxyethylene sorbitan fatty acid esters; sorbitan fatty acid esters; polyethylene glycols; polyoxyethylene stearates; mono and diglycerides; colloidal silicon dioxide; sodium dodecylsulfate; magnesium aluminum silicate; triethanolamine; stearic acid; calcium stearate; glycerol monostearate; cetostearyl alcohol; cetomacrogol emulsifying wax; short and medium chain alcohols; Oleoyl polyoxyl-6 glycerides; Plurol oleique; propane-1,2,3-triol, polyvinyl alcohol and dioctyl sodium sulfosuccinate (DOSS); wherein the at least one natural material is selected from the group consisting of plants, cyanobacteria, algae and fungi. a. Providing at least one natural material having a particle size (D 100) of less than 320 μm, other than an extract; b. Dispersing said at least one natural material of step a. in a solvent; c. Milling the dispersion of step b. to a particle size (D 90) of below 1000 nm (D 90 < 1000 nm), wherein the at least one natural material is dispersed in step b. in a concentration of from 0.5 to 20 % (w/w), based on the total amount of solvent used in the nanosuspension, and wherein the dispersing step b. or the milling step c. comprises the addition of a stabilizer; wherein the stabilizer is selected from the group consisting of phospholipids; polysorbates; hydroxypropyl cellulose, hydroxypropyl methylcellulose (HPMC) and polyvinylpyrrolidone; nonionic tri-block copolymers; copolyvinylpyrrolidone; Caprylocapropyl polyoxyl-8 glycerides; Lauraoyl polyoxyl-32 glycerides; gelatin; lecithin (phosphatides); gum acacia; cholesterol; tragacanth; polyoxyethylene alkyl ethers; polyoxyethylene castor oil derivatives; polyoxyethylene sorbitan fatty acid esters; sorbitan fatty acid esters; polyethylene glycols; polyoxyethylene stearates; mono and diglycerides; colloidal silicon dioxide; sodium dodecylsulfate; magnesium aluminum silicate; triethanolamine; stearic acid; calcium stearate; glycerol monostearate; cetostearyl alcohol; cetomacrogol emulsifying wax; short and medium chain alcohols; Oleoyl polyoxyl-6 glycerides; Plurol oleique; propane-1,2,3-triol, polyvinyl alcohol and dioctyl sodium sulfosuccinate (DOSS); wherein the at least one natural material is selected from the group consisting of plants, cyanobacteria, algae and fungi. wherein the at least one natural material is dispersed in step b. in a concentration of from 0.5 to 20 % (w/w), based on the total amount of solvent used in the nanosuspension, and wherein the dispersing step b. or the milling step c. comprises the addition of a stabilizer; wherein the stabilizer is selected from the group consisting of phospholipids; polysorbates; hydroxypropyl cellulose, hydroxypropyl methylcellulose (HPMC) and polyvinylpyrrolidone; nonionic tri-block copolymers; copolyvinylpyrrolidone; Caprylocapropyl polyoxyl-8 glycerides; Lauraoyl polyoxyl-32 glycerides; gelatin; lecithin (phosphatides); gum acacia; cholesterol; tragacanth; polyoxyethylene alkyl ethers; polyoxyethylene castor oil derivatives; polyoxyethylene sorbitan fatty acid esters; sorbitan fatty acid esters; polyethylene glycols; polyoxyethylene stearates; mono and diglycerides; colloidal silicon dioxide; sodium dodecylsulfate; magnesium aluminum silicate; triethanolamine; stearic acid; calcium stearate; glycerol monostearate; cetostearyl alcohol; cetomacrogol emulsifying wax; short and medium chain alcohols; Oleoyl polyoxyl-6 glycerides; Plurol oleique; propane-1,2,3-triol, polyvinyl alcohol and dioctyl sodium sulfosuccinate (DOSS); wherein the at least one natural material is selected from the group consisting of plants, cyanobacteria, algae and fungi.