This marinade includes a combination of dried Guajillo and ancho chiles, along with other spices and seasonings. While the marinade has some level of spiciness, it is generally not considered hot. Guajillo and ancho chile are not spicy at all. If you want to make it spicy, you may add chile de arbol into the mix. It's great to know that the spiciness of al pastor can be customized to suit individual tastes.