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E321AntioxidantElevated concern
Butylated Hydroxytoluene
In plain words
The short version
A synthetic phenolic antioxidant (BHT), the close relative of BHA, used to prevent rancidity in fats and packaged foods.
Why we flag it
A synthetic antioxidant that keeps fats from going rancid. Animal studies raised questions about its safety at high doses, and its effects are still debated at food levels. That's why we flag it.
Safety profile
ADI of 0.25 mg/kg body weight. Animal studies have raised concerns about endocrine and hepatic effects at high doses; human relevance debated. Some studies suggest anti-tumor activity, others suggest tumor-promoting. Several jurisdictions are progressively reducing permitted uses.
The detail
Educational information only. Not medical or dietary advice.