BHA / BHT

Also labeled as: Butylated hydroxyanisole, Butylated hydroxytoluene, E320 / E321

Synthetic antioxidant preservatives used to keep fats and oils in packaged snacks from going rancid.

Regulatory status: Permitted in the US. BHA is listed by California's Proposition 65 as a substance known to the state to cause cancer, based on animal studies; the FDA classifies both as safe at approved levels.