We don't sell hydroquinone due to safety reasons. The FDA has announced to soon put a ban on hydroquinone as it has been shown to cause ochronosis in humans (skin darkening and disfiguration) and cancer in mice. If you still want to use hydroquinone, it is typically used at a concentration of 1-2% (1-2 g of hydroquinone per 100g of cream) and it is added to water phase in emulsions since it is water-soluble.
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