Brominated vegetable oil, commonly called BVO, is a vegetable oil chemically modified with bromine, historically used in tiny amounts to keep citrus flavoring evenly distributed in soft drinks. Without it, the lighter flavor oils would float to the top of the bottle, creating an uneven taste. The FDA revoked its authorization for use in food, and manufacturers have been reformulating their products to remove it.
How BVO Works in Beverages
Citrus flavor oils are lighter than water. If you simply mix orange or lemon flavoring into a water-based drink, the oils rise to the surface and form a visible ring at the top. BVO solves this problem because adding bromine atoms to vegetable oil makes it denser, heavy enough to match the density of the surrounding liquid. When blended with the citrus oils, it acts as a weighting agent that keeps them suspended throughout the drink rather than separating out.
When it was permitted, BVO could be used at concentrations no higher than 15 parts per million. That’s an extremely small amount, roughly equivalent to 15 drops in a million drops of liquid. It was never used in all soft drinks, only in certain citrus-flavored beverages where flavor separation was a problem.
Why the FDA Revoked Its Authorization
BVO had been permitted in U.S. food since the 1970s under a narrow allowance, but mounting evidence raised concerns about how bromine accumulates in the body over time. The FDA formally revoked the authorization, citing studies that showed potential health effects at levels previously considered safe. Several other countries, including those in the European Union, Japan, and India, had already banned it years earlier.
The decision wasn’t sudden. California passed legislation restricting BVO before the federal ban took effect, and major beverage companies like PepsiCo and Coca-Cola had already begun removing it from their formulas voluntarily in response to consumer pressure and international regulations.
Health Concerns and Bromine Buildup
The core worry with BVO is that bromine doesn’t leave your body quickly. With regular consumption, it can accumulate in fatty tissues and organs. Animal studies linked this buildup to changes in thyroid function and heart tissue damage. In humans, the concern centers on a condition called bromism, which occurs when bromine levels in the body climb high enough to interfere with normal brain function.
Bromism from soft drink consumption is rare but documented. In one case published in the Journal of Toxicology: Clinical Toxicology, a patient who drank excessive amounts of cola developed headache, fatigue, and memory loss that worsened over 30 days. He eventually lost coordination and could no longer walk. A drooping eyelid on one side initially led doctors to suspect a brain lesion, prompting an extensive neurological workup before bromine toxicity was identified as the cause.
The classic symptoms of bromism include headache, irritability, fatigue, slurred speech, loss of coordination, emotional instability, tremor, and hallucinations. Some patients develop focal eye symptoms like unequal pupils or involuntary eye movements. An acne-like skin rash has been described but only appears in a minority of cases, making it an unreliable clue for diagnosis. In the documented cola case, the patient was discharged but returned two weeks later with headache, light sensitivity, and increasing lethargy, then again five days after that unable to walk and with severe memory and concentration problems.
These cases involved extreme consumption levels well beyond what most people would drink. But the fact that bromine accumulates over time, rather than being cleared quickly, is what ultimately tipped the risk assessment against allowing BVO in food at any level.
What Replaced BVO in Drinks
Beverage manufacturers have three main alternatives to choose from, all of which are approved food additives or generally recognized as safe. Sucrose acetate isobutyrate (often listed as SAIB on ingredient labels) works as a weighting agent in much the same way BVO did. Glycerol ester of wood rosin, sometimes called ester gum, serves a similar density-matching function. Locust bean gum, also labeled as carob bean gum, takes a different approach by thickening the liquid enough to keep flavor oils from separating.
If you’re checking ingredient labels on citrus-flavored drinks, you’ll likely see one of these three listed where BVO once appeared. Most major brands completed their reformulations before the federal ban took effect, so the transition for consumers has been largely invisible.
How to Know If You’ve Been Drinking BVO
BVO was never in most beverages. It appeared primarily in store-brand and regional citrus-flavored sodas and some sports drinks. Major brands like Mountain Dew removed it years ago. If a product still contained BVO, it was required to be listed on the ingredient label as “brominated vegetable oil,” so checking the label was always the most straightforward way to identify it.
For anyone who drank BVO-containing beverages occasionally, the health risk was negligible. The documented cases of bromism involved consumption patterns far outside the norm, often multiple liters per day sustained over weeks or months. With the FDA’s revocation now in effect, BVO is no longer authorized for use in any food sold in the United States.