Method for producing composite containing amorphous curcumin and/or analogue thereof

Provided is a method for easily producing a composite that contains amorphous curcumin and/or an analogue thereof in high concentration at low cost, said composite having a high content of curcumin and/or an analogue thereof and improved absorption of curcumin and/or an analogue thereof in the body by oral intake. A method for producing a composite of curcumin and/or an analogue thereof and hydroxypropyl methylcellulose and/or hydroxypropyl cellulose, said composite containing amorphous curcumin and/or an analogue thereof, which is characterized by comprising: a step for dissolving curcumin and/or an analogue thereof and hydroxypropyl methylcellulose and/or hydroxypropyl cellulose into an aqueous solution having a pH of 12 or more; and a step for decreasing the pH of the solution to 7 or less.