If you don't have a trademark, you can still register a brand on Amazon. You can use your company name or product name as the brand name, and then complete the brand registration process on the Amazon website.

During the registration process, you will need to provide relevant business proof and brand information to complete the verification. Although not having a trademark may limit some brand protection rights, you can still build and sell your products on Amazon. It is recommended that you conduct sufficient market research and legal consultation before brand registration.