Recently, my mother-in-law asked someone to bring a lot of health care products and medicinal oils from Xianggang. She took a bottle of Huang Daoyi Collateral Oil and asked me to see if it was genuine, so I wouldn't know what to do. you can check whether it was purchased through an officially recognized channel (e.g. Tmall, JD.COM Huaruntang). Besides, You can check the outer packaging, inner packaging and other methods to identify the authenticity:

1. Huang Daoyi registered trademark

2. Chinese patent medicine registration number HKP-1668

3. Red wavy anti-counterfeiting diagonal tear strips are printed with the words "Collateral Oil and WONG TO YICK＂" in Huang Daoyi

4. The box adhesive film and single box are printed with laser patterns

5. Made in Hong Kong.