A: Qing Zi Su Yan Cosmetics is a kind of skin care product for plain skin, whose main function is to brighten skin tone and improve skin quality. According to the product promotion, Qing Zi Su Yan Cosmetics contains natural ingredients and no harmful substances, which can enhance the natural beauty of the skin.

I can't provide specific information about whether it is legal or not. According to China's relevant laws and regulations, cosmetics need to be approved and registered in National Medical Products Administration before they can be sold in the market. It is recommended that you check the relevant qualification certificates of the products before purchasing, such as the registration number approved by the State Medical Supplies Administration (CFDA), to ensure that you are purchasing legal products.

In addition, in order to protect your rights and interests, you should choose formal channels to buy any cosmetics, and pay attention to check the ingredient list and instructions of the products to avoid adverse effects on your health. If you have questions about the product or need more detailed information, it is recommended to consult a professional or contact the product manufacturer for confirmation.