BHA (Butylated hydroxyanisole)

Here's the honest, both-sides version: IARC lists BHA as a possible carcinogen (Group 2B), based largely on forestomach tumours in rodents — and humans don't have a forestomach, so that specific finding's relevance is genuinely debated. What's harder to dismiss is the suspected hormone (endocrine) activity. Regulators permit it with an ADI of 1.0 mg/kg and most people stay under it, but cleaner antioxidants (vitamin E, rosemary extract) do the same job — so this is an easy one to minimise rather than panic over.