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ENVIRONMENTAL WORKING GROUP. Spent grain wax. Disponível em: https://www.ewg.org/skindeep/ingredients/724090/. Acesso em: 15 abr. 2021.
INCI DECODER. Spent grain wax. Disponível em: https://incidecoder.com/ingredients/spent-grain-wax. Acesso em: 15 abr. 2021.
PUREZA NATURE. Spent grain wax. Disponível em: https://www.purezanature.com/spent-grain-wax.. Acesso em: 15 abr. 2021.