: Ensure you are buying "USP Grade" (United States Pharmacopeia), which is safe for pharmaceutical/cosmetic use, rather than "Technical Grade," which is meant for industrial photography or dye manufacturing.
Pure hydroquinone (often 99% purity) is typically sold through chemical supply houses and specialized cosmetic ingredient retailers rather than standard beauty stores. buy pure hydroquinone powder
The availability of hydroquinone has changed significantly in recent years due to health regulations. : Ensure you are buying "USP Grade" (United