It sure is. Sodium benzoate is a powder that's made by combining benzoic acid with lye, also called sodium hydroxide. This combination does not occur in nature, but benzoic acid can be found in some fruits, plants, and fermented foods.

On its own, sodium benzoate is harmless. What causes trouble is when it's added to products containing vitamin C or ascorbic acid, as it's commonly called on food labels. When these two substances meet, they can turn into benzene, a known carcinogen. This combination is commonly found in soft drinks and is particularly a concern with diet sodas as sugar seems to blunt some of the negative effects of the duo. (via FBC Industries).

In addition to possibly forming a carcinogen, a 2016 study published in Physiology International linked the additive to tissue inflammation. A 2014 study published in Sage Journal found a correlation between sodium benzoate consumption and ADHD. A decrease in leptin, which controls appetite, was concluded in a 2011 study from the British Journal of Nutrition, and free radical formation resulted in a 2014 study via Scientific World Journal.

While deemed safe in specific amounts by the FDA, and more studies are needed to draw further conclusions on any purported dangers, it's always best to do your due diligence and read labels when your health is at stake.

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Is It Dangerous To Drink Beverages That Contain Sodium Benzoate? - Tasting Table