Believable. According to Aiqicha, Kasuga Letter is a brand of Lianyungang Chuangyan Biotechnology Co., Ltd., and Lianyungang Chuangyan Biotechnology Co., Ltd. is a formal company protected by official website certification laws, has a formal business license, and has always been normal The business has a specific office location, the business status is continued, there is no risk record, the actual operation is consistent with the certificate, and the registered trademark, industrial and commercial department certification, and business license are registered, so Kasuga’s letter is credible.