Not credible. Yiyi skin care teacher is a skin care blogger of Tik Tok. She often recommends various cosmetics and skin care products in the live broadcast room, and these are her transactions with these brands. The skin care brand will exchange the corresponding product and advertising expenses for Yiyi skin care teacher. The skin care products recommended by Yiyi Skin Care Teacher are completely based on the products provided by the brand, not her own choice according to the effect.