a method for authenticating the contents of containers . the method utilizes a security label including a removable piggyback label having an authentication feature . the method generally includes : obtaining a bulk container with contents stored therein , the container labeled with the security label and the authentication feature indicative of the contents ; transferring at least a portion of the contents from the bulk container to a consumer container ; and transferring the piggyback label having the authentication feature to the consumer container to verify the authenticity of the transferred contents . this method is useful when transferring pharmaceutical products from a bulk container to individual consumer containers because consumers can be confident that the pharmaceuticals stored by their containers are authentic .