A method of manufacturing a chitosan composition comprising steps performed in the following specific order: (i) preparing materials; (ii) creating a chitin ingredient from shrimp shells; (iii) creating a chitin ingredient from oyster mushroom; (iv) creating a chitin mixture by homogenously mixing the chitin ingredient from shrimp shells with the chitin ingredient from oyster mushroom; (v) loading the chitin mixture into the centrifugal spray drying device having predetermined specifications to create the chitosan composition; and (vi) packaging and preservation.
