Exemplary embodiments relate to a oral film including an anti-oxidative material having a high level of activity and a method for manufacturing the oral film for protecting the activity of an anti-oxidative material. The activity of the anti-oxidative material is retained under harsh conditions. An exemplary embodiment includes manufacturing a prolamin-based film for oral delivery. The method includes preparing a solution containing prolamin, glycerol formal, an anti-oxidative material, and a solvent including alcohol, and evaporating the solvent under a reduced pressure condition at a temperature of 0° C. to 80° C. An exemplary embodiment also includes a film for oral delivery, prepared by the preceding method, the film includes an anti-oxidative material that maintains activity at a high level. An exemplary embodiment also includes a film for oral delivery, prepared by the immediately preceding method, the film including prolamin, glycerol formal, and an anti-oxidative material having a high level of activity.
