The best way to see if you are allowed to sell a product on Amazon is to see if someone else is selling it already.

This statement is false. While seeing others sell a product might suggest it's permissible, it doesn't guarantee your own eligibility. Amazon has strict policies regarding product categories, brand restrictions, intellectual property rights, and seller qualifications. Many brands restrict who can sell their products on Amazon, often requiring explicit authorization or a reseller agreement. Additionally, some products may require specific certifications or approvals that not all sellers possess. Relying solely on the presence of other sellers can lead to account suspensions, product removal, or legal issues if you infringe on intellectual property or violate Amazon's terms of service. Always verify your eligibility directly through Amazon's seller central or by contacting the brand owner.