Hydroquinone and Cosmetics, Explained: Why It Is Missing From Labels in the EU and US, What a Hydroquinone-Free Claim Does Not Tell You, and What a 70-Store Survey Found

The EU rule: prohibited in cosmetics, with narrow exceptions

Hydroquinone (INCI name Hydroquinone, also written 1,4-dihydroxybenzene) is listed in Annex II of Regulation (EC) No 1223/2009, the list of substances prohibited in cosmetic products. The Annex II wording is "with the exception of entry 14 in Annex III", the restricted-substances list. According to the EU's cosmetic ingredient database, CosIng, that Annex III entry is the only route back in, and it covers specific professional uses such as artificial nail systems, not skin-lightening creams.

The ban on skin lightening is older than the current regulation. Commission Directive 2000/6/EC, dated 29 February 2000, amended the earlier cosmetics directive so that hydroquinone could no longer be used in skin-lightening products, effective 1 January 2001. For the exact conditions in Annex III, read the current text on EUR-Lex instead of a summary.

The US rule: no longer an OTC drug

In the United States, skin-lightening products are handled as drugs rather than ordinary cosmetics. For years, 2 percent hydroquinone products were sold over the counter. After the 2020 CARES Act reformed the OTC drug system, the FDA states that OTC skin-lightening products containing hydroquinone are "unapproved drugs and are not generally recognized as safe and effective." On 19 April 2022 it issued warning letters to 12 companies selling them.

The same FDA page states that Tri-Luma, a prescription product, is the only FDA-approved drug containing hydroquinone. So the practical result on both sides of the Atlantic is similar: a lightening product sold as an ordinary cosmetic should not contain it.

What "hydroquinone-free" does and does not say

The phrase is a statement about one ingredient. It is not a regulatory category, it does not describe the rest of the formula, and it does not mean an outside laboratory tested the product. Because the ingredient is already off the legitimate cosmetic market, the phrase mostly shows that a brand knows the word worries shoppers. A product with a full ingredient list, a named company and an address gives you something to check. A product with a handmade label, no label or no ingredient list gives you nothing to check, whatever its front panel says.

What a 2025 store survey reported

Because the ingredient is restricted, researchers have asked whether it still reaches shelves. Arora, Brumley and Hylwa published a cross-sectional study in the Journal of Cosmetic Dermatology in March 2025, titled "Prescription Ingredients in Skin-Lightening Products Found Over-the-Counter Post-Hydroquinone Ban: Cross-Sectional Study of 70 Stores in the Twin Cities." Their reported numbers:

• 70 stores were visited, and 32 (45.7%) sold skin-lightening products
• 7 of those 32 stores (21.9%) sold products containing hydroquinone
• 11 of the 32 (34.4%) sold prescription-strength topical corticosteroids as lightening products
• Four of the seven hydroquinone finds (57.1%) and seven of the eleven corticosteroid finds (63.6%) were at Hmong or Somali stores

The authors describe hydroquinone use as associated with exogenous ochronosis, periorbital hyperpigmentation, vitiligo-like lesions and contact dermatitis. Read the study for what it is: a snapshot of one metropolitan area, counted by store. It shows what was on shelves, not how many people use the products or what is inside a particular jar, and the store-type clustering says nothing about the shoppers themselves.

Mercury, and labels that say nothing

Hydroquinone is not the only concern with illegal lightening products. The FDA says it does not allow mercury in drugs or in cosmetics, except under very specific conditions where there are no other safe and effective preservatives, and it notes that people exposed to mercury-containing skin products have had elevated mercury levels. It lists the label words mercurous chloride, calomel, mercuric, mercurio and mercury, and warns that if ingredients are not listed and there is no product label, a buyer should not assume the product is fine. For exposure concerns the FDA page points to a poison center at 1-800-222-1222.

Other names you will see on legal labels

The ingredients that do appear on cosmetic labels in this area are a separate group with their own status and evidence. Our explainer on alpha arbutin, tranexamic acid and vitamin C describes what each name means, and our guide to 4-butylresorcinol covers a lab comparison that mentions hydroquinone by name. They explain label terms; they are not substitutes for anything. For why persistent brown patches are a question for a clinician, see melasma versus sun spots.

Short summary

In the EU, hydroquinone is on the prohibited list for cosmetics apart from narrow Annex III exceptions, and the skin-lightening ban dates from 2001. In the US, OTC hydroquinone lightening products lost that status after the 2020 reform. "Hydroquinone-free" is a one-ingredient phrase, not proof of anything else, and unlabeled products can hide ingredients entirely. Uneven skin tone that concerns you belongs with a dermatologist. Our guide on how to patch test a new skincare product covers the cosmetic side of trying something new.

This article is general information, not medical advice. Cosmetic products do not treat or prevent disease. Patch test any new product and consult a dermatologist about pigmentation or other skin concerns. Sources: Regulation (EC) No 1223/2009, Annex II and Annex III entry 14 (via EU CosIng); Commission Directive 2000/6/EC; FDA drug safety communication of 19 April 2022; FDA consumer update on mercury in skin products; Arora, Brumley and Hylwa, Journal of Cosmetic Dermatology, March 2025; checked October 2026.