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: Companies like Sigma-Aldrich or Fisher Scientific provide laboratory-grade hydroquinone, though they often require a business or institutional account.

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: Always request a Certificate of Analysis (CoA) from the vendor to verify the purity and ensure it is free from heavy metal contaminants. : Companies like Sigma-Aldrich or Fisher Scientific provide

: You may find listings on eBay or Amazon from third-party sellers, but purity and storage conditions can be difficult to verify. Regulatory and Safety Considerations buy pure hydroquinone powder