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Transplantation of activated olfactory ensheathing cells by curcumin strengthens regeneration and recovery of function after spinal cord injury in rats

Reference Galvez, Garrido, Rodriguez-Cabezas, Ramis, Sanchez de Medina, Merlos and Zarzuelo2003)

They can contain a natural ingredient such as soy, liquorice or arbutin, sometimes combined with the medical lightening agent hydroquinone (not all creams contain this: hydroquinone is a potentially carcinogenic ingredient, and products containing it are banned or restricted in Ghana, South Africa, the Ivory Coast, Japan, Australia and the European Union, though they are still used illegally)