Adding fat to spicy food in whatever form will make it tad less spicy after the cooking like yogurt, sour cream and the likes, but it won't protect your butt. But carolina reaper just do not use em unless you are some weird ass hothead. Those are not there to make food nice and tasty just painful. Habanero and possibly something like Naga Jolokia is the upper limit. And even then used in moderation. And do not use the seeds. If you want some taste from these hottest peppers easier way is to buy some ready made sauce that is not filled with vinegar.