It sounds like you're concerned about the authenticity of a product you've ordered and whether you can cancel it at the last moment.

• Regarding product authenticity: Without specific details about the product or seller, it's difficult to determine if the product is genuine. To verify authenticity, check for official branding, packaging quality, seller reputation, and reviews. If you suspect the product is fake, avoid using it and report the issue to the seller or platform.

• About canceling the order at your doorstep: Many sellers or delivery services have policies about cancellations. Typically, once the product is out for delivery or at your doorstep, cancellation may not be possible, but you might be able to refuse the delivery or return the product afterward depending on the return policy.

For precise guidance, review the seller’s cancellation and return policies or contact their customer service directly.

If this product relates to health or medical use, I strongly recommend consulting a relevant specialist doctor before use to ensure safety and appropriateness.