Enforcement Rules of the Act Governing Food Safety and Sanitation Article 19

The labeling of pre-packaged foods, food raw materials, food additives and their raw materials shall be handled in accordance with the following provisions:1.The length and width of the characters on the label shall not be less than two millimeters. However, where the area of the largest surface of a package is less than 80 square centimeters, characters for items other than the product name, company name, and expiry date, may be less than two millimeters.2.For domestically manufactured products, where labeling includes foreign languages, Chinese shall be the primary language, and any foreign language shall be supplementary.3.For imported products, a Chinese label shall be added in accordance with the provisions of Articles 22 and 24 of this Act before they may be imported. However, for products that require repackaging, sub-packaging, or other processing procedures, such products shall label the product name,company name, and date, or have other labels or information for proof of the authenticity of the items at the time of importation, and the labeling in Chinese shall be completed prior to sale.
中文原文 食品安全衛生管理法施行細則第19條
有容器或外包裝之食品、食品原料、食品添加物及食品添加物原料之標示,應依下列規定辦理:
一、標示字體之長度及寬度各不得小於二毫米。
但最大表面積不足八十平方公分之小包裝,除品名、廠商名稱及有效日期外,其他項目標示字體之長度及寬度各得小於二毫米。
二、在國內製造者,其標示如兼用外文時,應以中文為主,外文為輔。
三、輸入者,應依本法第二十二條及第二十四條規定加中文標示,始得輸入。
但需再經改裝、分裝或其他加工程序者,輸入時應有品名、廠商名稱、日期等標示,或其他能達貨證相符目的之標示或資訊,並應於販賣前完成中文標示。

English translation for reference only; the Chinese text prevails. Not legal advice.