To mix or not to mix, that is the question... In a world full of skincare ingredients, some are just better together while some others... not so much. Bookmark this cheatsheet to make all the right mo... To mix or not to mix, that is the question... In a world full of skincare ingredients, some are just better together while some others... not so much. Bookmark this cheatsheet to make all the right moves when it comes to finding your best ingredient pairings