In November 2019 researchers from Cosmetic Ingredient Review Panel in the USA published their safety assessment on cosmetic ingredients obtained from Camellia sinensis (tea) plant. These ingredients are used in cosmetics as antioxidants and skin conditioning agents. The Panel reviewed relevant studies related to these substances. It was noted that the use of leaf-derived ingredients in beverages resulted in a much larger exposure than was possible from cosmetic use. In view of this, concern over the toxicity potential of leaf-derived ingredients in cosmetics is not severe. However, the Panel stated that as final product formulations may contain multiple botanicals, each containing the same substances of concern, manufacturers of cosmetics should be aware of these substances to avoid them reaching levels that may lead to sensitization or other adverse effects. The Panel stated that the cosmetics industry should continue to use good manufacturing practices to limit impurities. The Panel concluded that the Camellia sinensis leaf-derived ingredients are safe in the present practices of use and concentration described in this safety assessment when formulated to be non-sensitizing. However, the available information was insufficient to determine whether the non-leaf-derived ingredients were safe for use in cosmetics.
Becker LC et al. Safety Assessment of Camellia sinensis-Derived Ingredients As Used in Cosmetics. Int J Toxicol. 2019 Nov/Dec;38(3_suppl):48S-70S