A composition that exerts an effect that increases serotonin in the brain through ingestion is provided. This agent for increasing serotonin in the brain contains epicatechin, which is obtained by steaming and drying camellia leaves to obtain dried camellia leaves, pouring an extract obtained by subjecting the dried camellia leaves thus obtained to distilled water or ethanol extraction on an ion exchange resin column, and then concentrating a 20% ethanol eluate to dryness.뇌내 세로토닌에 대해 경구 섭취에 의해 증가 작용을 발휘하는 조성물의 제공. 동백나무잎을 증자, 건조시켜 건조 동백나무잎을 얻고, 얻어진 건조 동백나무잎을 증류수 또는 에탄올로 추출한 추출물로 하여 이온 교환 수지 칼럼에 걸어, 20 ％ 에탄올 용출액을 농축 건조시킴으로써 얻어진 에피카테킨을 함유하는 뇌내 세로토닌 증가제.
