Mountain Dew isn’t outright banned in most countries, but for years it contained an ingredient that is: brominated vegetable oil, or BVO. This emulsifier, used to keep citrus flavoring evenly distributed in the drink, has been prohibited in the European Union since 2008 and was never approved in Japan or India. The U.S. itself finally revoked BVO’s approval in July 2024, catching up to regulations other nations put in place years or even decades earlier.
What BVO Does and Why It’s Controversial
BVO is vegetable oil bonded with bromine, a heavy element. In citrus-flavored sodas, it acts as a weighting agent that prevents the flavoring oils from floating to the top of the bottle. Without it (or a substitute), your drink would separate into layers.
The problem is what bromine does inside the body. Bromide ions distribute into extracellular fluids, red blood cells, muscles, the liver, and neural tissue in a pattern that mimics chloride, one of the body’s essential electrolytes. With repeated exposure, bromide intake can exceed the body’s ability to eliminate it. As levels rise, the kidneys start preferentially reabsorbing bromide over chloride, depleting the body’s chloride stores. In severe cases, up to 45% of total body chloride can be replaced by bromide.
This buildup is called bromism. Case reports have linked excessive consumption of BVO-containing soft drinks to symptoms of bromine toxicity, though reaching dangerous levels typically required very high intake over extended periods. A 2022 study that the FDA cited when proposing its ban found bromide accumulation in the heart, liver, and fat tissue of rats, providing the clearest evidence yet that even lower-level chronic exposure posed a risk regulators weren’t comfortable with.
Where and When BVO Was Restricted
The European Union banned BVO as a food additive under its 2008 regulation on food additives (Regulation EC No 1333/2008). The rule is straightforward: only additives explicitly listed in the regulation’s approved annexes may be used in food sold in the EU. BVO does not appear on those lists, making it illegal to use or market any product containing it across all EU member states. Japan and India similarly never approved BVO for use in food.
This meant that for over 15 years, the American formulation of Mountain Dew could not legally be sold in the EU, Japan, or several other markets. PepsiCo either reformulated the product for those countries or simply didn’t sell it there in the same form. Meanwhile, American consumers continued drinking a version that contained an ingredient most other developed nations had already rejected.
The U.S. Finally Caught Up in 2024
BVO had been used in American beverages since the 1920s. The FDA revoked its authorization on July 3, 2024, with an effective date of August 2, 2024. Companies were given one year from that date to reformulate, relabel, and clear existing inventory before enforcement begins.
PepsiCo had already started moving away from BVO before the ban. After public pressure, the company announced it would replace BVO in Gatorade with a substitute emulsifier that serves the same function (keeping flavoring oils suspended) but is approved worldwide. Mountain Dew followed a similar path. By the time the FDA acted, BVO had already disappeared from many major beverage labels in the U.S., though smaller brands were slower to reformulate.
Food Dyes Add Another Layer
BVO gets most of the attention, but Mountain Dew’s artificial colors also face stricter rules abroad. The drink’s signature yellow-green color comes partly from Yellow 5 (tartrazine), a synthetic dye that is permitted in the EU but subject to mandatory labeling. All food colors used in the EU must be individually authorized after a safety assessment by the European Food Safety Authority, and their presence must be clearly declared on the label by name or E number.
The EU completed a re-evaluation of tartrazine in 2009 and kept it on the approved list, so it’s not banned. But the regulatory climate around artificial dyes is considerably more cautious in Europe than in the U.S., and the labeling requirements can influence how companies choose to formulate products for different markets. Some manufacturers opt for natural colorants in their European versions to avoid the added label disclosures.
What This Means for the Drink Today
Mountain Dew sold in the U.S. today no longer contains BVO. The reformulated versions use alternative emulsifiers that keep the citrus flavoring blended without introducing bromine into the body. If you’re drinking Mountain Dew purchased from a store in 2025, the BVO issue is effectively resolved regardless of where you live.
The broader story, though, is about how different countries weigh food additive risks. The EU operates on a precautionary model: additives must be proven safe and explicitly approved before they can be used. The U.S. historically allowed additives unless they were shown to be harmful, which is why BVO remained legal for decades after other countries removed it. The 2024 ban represents a shift, with the FDA citing accumulating animal data rather than waiting for widespread human harm.