The Sharethrough branded content is not traditional advertising but rather branded content about topics, such as a short film by Puma about nightlife or a candy-themed rap video by rapper Method Mad from Sour Patch Kids.

FORBES: Sharethrough's Sponsored Videos Bringing Branded Content To Websites, Apps

There is also a method that's not widespread called the atopy patch test, which involves wearing a pad containing the possible allergen for about 48 hours.

CNN: Food allergy diagnosis 'an inexact science'