BHT
BHT is an artificial antioxidant preservative. Animal study results are inconsistent — some high-dose studies raised cancer concerns while others found no effect — and IARC lists it as Group 3 (not classifiable as to carcinogenicity in humans). Typical levels are legal; if you prefer to avoid it, choose products preserved with mixed tocopherols (vitamin E).
Other common names: butylated hydroxytoluene, 二丁基羥基甲苯, ジブチルヒドロキシトルエン
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Sources: ASPCA Animal Poison Control Center, FDA Center for Veterinary Medicine, veterinary literature.
For reference only, not medical advice. If poisoning is suspected, seek veterinary care immediately.