Stop for a moment, and imagine a classic combination. Two things that just go so well together, they should never be apart. Iconic duos that usually come to mind include ketchup and mustard, Elon Musk and Tesla, Bonnie and Clyde, strawberries and cream, salt and pepper. And you can probably think of a lot more. But one of the most classic combinations in the book is without a doubt peanut butter and jelly. We've paired peanut butter and jelly together for decades. It feels like one doesn’t belong without the other. But in this day and age, maybe the combination should be peanut butter and allergies.