According to various sources, the worlds most sour candy is Toxic Waste Hazardously Sour Candy. This candy is sold in novelty "toxic waste" drums, and it has the highest sour intensity, duration, and coating on the list. Other extremely sour candies include Barnetts Mega Sour Fizz Bombs, Warheads, Sour Skittles, Cry Baby Gum, and Nobel Super Lemon Candy. However, the sourness of these candies is not as intense as Toxic Waste. It is worth noting that the level of sourness in any candy depends on the acids used to make it, such as citric acid, ascorbic acid, malic acid, fumaric acid, and tartaric acid.