Buy Pure Hydroquinone Powder -

: Never "eyeball" measurements. Use a milligram scale to ensure your final formulation stays within safe limits (typically 2% to 4%).

: 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.

If you choose to purchase pure powder for personal formulation:

: Websites like Lotioncrafter , MakingCosmetics , and Bulk Apothecary often carry high-purity active ingredients for formulators.