It should be a production error.

General products, especially regular products, will have their own logo, production date and expiry date.

If there is really no This kind of product should be considered a substandard product.

No logo. It means this product is fake. It is a counterfeit product. It's best not to buy it.

It is normal to have no trademark. The absence of a trademark does not mean that the product is fake. Some companies have not applied for a trademark.