The active ingredient is only 4% hydroquinone. The inactive ingredients include: Alcohol, Radical alcohol, Butylated hydroxytoluene, Carbomer 940, Cetearyl alcohol, Ceteareth-20, Cetyl alcohol, Cyclopentasiloxane, Polysilicon-11, Dimethicone, Disodium EDTA, Fragrance, Glycerin, Radical stearate, PEG-100 stearate, Hydroxyacetic acid, Alter phospholipid, Linolic acid, Metal 1-ascorbyl phosphate, Phenoxyethanol, Phenyl trimethicone, Polyacrylamide It also has C13-14 Isoparaffin, Laureth seven, pure water, Na metabisulfite, Na change state dihydrate, E acetate, E alcohol, and triethanolamine. Fact Table Formula C6H6O2 License EU EMA, US FDA Bioavailability 43.3% Legal status RX Only Chemical Name Hydroquinone Topical Elimination half-life 12 hours Dosage (Strength) 4% Cream 30g (1 tube) Pregnancy Consult a doctor Brands Lustra Cream Protein binding - PubChem CID 785 MedlinePlus - ChEBI 17594 ATC code D11AX11 DrugBank - KEGG D00073 Routes of administration Topical