In its 2015 re-evaluation of octyl gallate (E311), the EFSA ANS Panel concluded the available database was too limited to establish an ADI or apply a margin-of-safety approach, and that owing to the lack of carcinogenicity and chronic-toxicity studies it could not reach a definitive conclusion on the presence or absence of a carcinogenic potential; a safety concern was unlikely only from the single use (chewing gum) for which data were provided.
EFSA could not confirm that octyl gallate is safe across its food uses: the data were too thin to set a safe daily limit or to rule a cancer risk in or out. It found no concern only for the single use (chewing gum) it had data for.