Butylated Hydroxyanisole vs Mineral Oil: which is worse?

What is Butylated Hydroxyanisole?

Butylated hydroxyanisole (BHA) is a synthetic phenolic antioxidant preservative derived from petroleum. It is a mixture of two isomeric compounds (2-BHA and 3-BHA). BHA prevents fats and oils from oxidizing (going rancid), extending shelf life. Its chemical formula is C11H16O2.

What is Mineral Oil?

Mineral oil (E905) is a refined petroleum product used as a food-grade lubricant, coating agent, and glazing agent in food processing and production. Food-grade mineral oil is a highly refined grade of petroleum distillate with specifications limiting impurities. It differs from pharmaceutical-grade (Vaseline) and cosmetic-grade mineral oils in refinement level.

Documented risks

Butylated Hydroxyanisole: BHA is classified by the International Agency for Research on Cancer (IARC) as Group 2B (possible human carcinogen) based on studies showing it causes papillomas and squamous cell carcinomas of the forestomach in rats, hamsters, and mice at high doses. A 1983 NTP bioassay confirmed these findings. The National Toxicology Program lists BHA as 'reasonably anticipated to be a human carcinogen' in its Report on Carcinogens. The forestomach is an anatomical structure found in rodents but not humans, creating some uncertainty about direct extrapolation. EFSA's 2012 re-evaluation (EFSA Journal 2012;10(10):2588) concluded that BHA may have endocrine-disrupting potential based on animal data showing interactions with estrogen receptors and androgenic hormone pathways. EFSA found the ADI of 1 mg/kg body weight but noted concerns about endocrine effects. Japan banned BHA for use in foods containing fats and oils, consistent with its generally precautionary approach to synthetic food preservatives. In cosmetics, the EU Scientific Committee on Consumer Safety (SCCS) has assessed BHA and found potential endocrine-disrupting effects at dermal exposure levels. EWG rates BHA as high-concern in Skin Deep cosmetics database. The antioxidant paradox applies: while BHA prevents lipid oxidation in foods, it may paradoxically act as a pro-oxidant in certain biological contexts at certain doses.

Mineral Oil: EFSA has raised significant concerns about mineral oil hydrocarbons (MOH) contamination in food through two pathways: (1) deliberate food-grade mineral oil use in coatings and processing, and (2) migration from recycled paper and cardboard food packaging into food. MOH comprises two types: mineral oil saturated hydrocarbons (MOSH), which accumulate in human adipose tissue, liver, and spleen, and mineral oil aromatic hydrocarbons (MOAH), which include polycyclic aromatic hydrocarbons (PAHs) that are potentially carcinogenic. A 2011 Swiss study found mineral oil hydrocarbons in human liver and spleen samples from autopsy, demonstrating real bioaccumulation. EFSA's 2023 preliminary opinion identified MOAH contamination in food as a safety concern that cannot be dismissed, recommending ALARA (as low as reasonably achievable) minimization. Untreated and mildly treated mineral oils are IARC Group 1 human carcinogens for occupational inhalation. Highly refined food-grade mineral oil (E905) is not classified as a direct carcinogen, but MOAH contamination in even food-grade mineral oil is an ongoing concern.