1. Herbal reaction: Some people are allergic or sensitive to some herbal ingredients. There are some active ingredients in the leaves of Platycladus orientalis, Angelica sinensis and Cyperus rotundus, which lead to allergic reaction of scalp and yellow hair.

2. Improper use: If these herbs are not properly treated or compatible, or used improperly, it will also lead to side effects, such as hair yellowing, and the use of herbal extracts with excessive concentration or long-term use of herbal shampoo will have a negative impact on hair.