Add shortcode in category description

Hello, i have to edit a site where the products are custom post type with Custom Field Suite.

I would like to show in category description the products of this category.

The problem is that shortcode does not work in category description, how can i enable it?

Also in the start of loop the code is: [loop type=product product_category=category-slug]
but it calls all the products.

Thank you very much.