A coating composition is provided to obtain catechin of green tea leaves with improved in vivo absorption and decreased bitter taste and gastrointestinal disorder of the catechin and improve physical properties and in vivo absorption of isoflavone. A coating composition for oral administration comprises a vegetable oil including 80-92 wt.% of a C18 fatty acid such as stearic acid, oleic acid, linoleic acid, linolenic acid and licinoleic acid and 8-12 wt.% of a C16 fatty acid such as palmitic acid and hexadecenoic acid, wherein the vegetable oil is at least one selected from the group consisting of soybean oil, linseed oil and olive oil. The composition is used for coating isoflavone or catechin of green tea leaves. An oral coating formulation comprises: 50-70 wt.% of a core layer including an oral effective ingredient； and 30-50 wt.% of a coating layer formed on the core layer and including the vegetable oil. Further, the vegetable oil is hardened by adding hydrogen.본 발명은 경구용 피복 조성물에 관한 것으로, 보다 구체적으로는 탄소수 18개의 지방산 80~92 중량% 및 탄소수 16개의 지방산 8~12 중량 % 함유하는 식물성 유지를 포함하는 경구용 피복 조성물에 관한 것이다.본 발명에 따른 경구용 피복 조성물을 이용하면 생체 흡수율이 향상될 뿐만 아니라 카테킨의 쓴맛과 위장장애가 저감된 녹차 카테킨을 제공할 수 있고, 또한 난용성 물질인 이소플라본이 지용성으로 물성이 개선되고, 생체내 흡수율을 높인 이소플라본을 제공할 수 있다.
