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the best combinations of substances based on hydroquinone. But, in order to purchase these remedies a prescription will be needed. Glyquin - a complex combination of substances which brings together 4% hydroquinone, SPF15 and 10% glycolic acid. This treatment is highly efficient and does not have sodium metabisulfite in its composition. Lustra - a combination of 4% hydroquinone and a similar quantity of glycolic acid. Lustra AF - the same combination of 4% hydroquinone and 4% glycolic acid to which a SPF 15 is added. Alustra - a treatment made up of retinol and 4% hydroquinone. Tri-Luma - in addition to the 4% hydroquinone present in all of these compounds, this treatment also contains 0.05% tretinoin and 0.01% fluocinoloneacetonide. Because the latter ingredient is a potent 37