Aloe products are increasingly valued as ingredients in food supplements and flavoring agents. In early March 2020, the European Commission drafted a ban on the use of Aloe products that contain hydroxyanthracene derivatives (HADs) in food, following the opinion on concerns about the toxicity of vegetable extracts containing HADs carried out by the European Food Safety Authority (EFSA). Aloe gel preparation is characterized by minimal amounts of HADs, only present as contaminants during extraction, compared to other sold Aloe preparations such as Aloe latex and Aloe whole leaf extract. This review provides a comprehensive account of the toxicological aspects of Aloe gel, and briefly discusses the chemical profile of other Aloe preparations. Unlike these other preparations, pure Aloe gel shows no toxic effects. However, further toxicological studies remain necessary to establish the maximum permissible limit of HAD contaminants in Aloe gel, considering daily doses and maximum duration of treatments. Finally, officially validated analytical methods for determination of HADs are required, in the form of tools for use by Companies and Competent Authorities to ensure the absence of HAD contamination in raw materials or in finished products.
Keywords: Aloe gel; Aloe juice; Chemical composition; Developmental toxicity; Food supplement; Genotoxicity; Hydroxyanthracene derivative; Repeat-dose toxicity; Reproductive toxicity; Toxicology.
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