Brominated vegetable oil

Citrus flavour oil does not mix with water. Left alone it separates and floats, which in a clear bottle looks like a fault. Brominated vegetable oil solved that: adding bromine makes the oil denser, dense enough to stay suspended in the drink.

It did that job in American soft drinks for decades. It no longer does, and the reason it stopped is the most useful thing on this page.

What FDA did, and what it said

The final rule is short and unusually plain. FDA revoked “the authorization for the use of brominated vegetable oil (BVO) in food”, and the reason given is that “there is no longer a reasonable certainty of no harm from the continued use of BVO in food”.

The rule took effect on 2 August 2024. There were no other authorised uses to revoke; the fruit-flavoured beverage use was the only one.

The evidence behind it is named. FDA worked with the National Center for Toxicological Research and the National Institute of Environmental Health Sciences to design new rodent studies aimed at thyroid toxicity and bioaccumulation. Those studies, published in 2022, “confirmed previous reports that dietary exposure to BVO is toxic to the thyroid and results in bioaccumulation of lipid-bound bromine in the body at doses relevant to human exposure”.

That last phrase is the one that matters. Plenty of animal findings occur at doses no person could reach, and this site spends a lot of time on that distinction. Here the agency specifically recorded that the doses were relevant.

Why this page is worth having after the fact

The ingredient is gone, so a reader might reasonably ask why it needs an entry.

Because it is the clearest example on the site of the process working, and it is the counterweight to a widespread belief that nothing is ever removed once permitted. Something was permitted, questions were raised, the agency commissioned the specific studies that would answer them, the studies answered them, and the permission was withdrawn with the reasoning published.

It also shows how long that takes. California had already acted, prohibiting BVO in food sold in the state from 1 January 2027, before the federal revocation landed. Both directions of the banned-elsewhere question are visible in one ingredient.

What replaced it

Mostly nothing, in the sense that manufacturers reformulated rather than substituting one for one. Where an emulsifier is still needed, the usual choices are gum-based systems and Polysorbate 80, or a formulation that simply tolerates a little separation.

Cloudy citrus drinks were always the easier case, because a suspension you can see is not a defect there.

The bromine family

Potassium bromate is the other bromine compound in food, and the two are worth keeping apart. Bromate is a flour treatment that is meant to be consumed during baking. BVO was an emulsifier that stayed in the drink and, as the studies found, accumulated.

Different jobs, different arguments, and only one of them has now been settled federally.