# Hydroquinone

URL: https://app.greenveil.ai/ingredients/ingredient_cas_123_31_9
Categories: beauty, industrial, pharma
Functions: Antioxidant, Bleaching agent, diols, Dye, Flavouring and nutrient, Fragrance, Monomers, polymerization initiators / inhibitors / catalysts>inhibitors, polyols, Reducing agent, Stabilizing agent
Identifier: 123-31-9

> Hydroquinone is used as antioxidant / bleaching agent. Greenveil chemical-concern score: 100/100 — Critical concern driven by cmr.. Assessed from 9 sources.

## Safety assessment

- Chemical concern score: 100/100 — Critical concern driven by cmr.
- Confidence: 4
- Rationale: 1,4-Dihydroxybenzene (Hydroquinone), with the exception of entry 14 in Annex III is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

## Regulatory status

- CA: Restricted — Restricted by the Health Canada Cosmetic Ingredient Hotlist for cosmetics.
- EU: banned — Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products. CMR: Carcinogenic Cat. 2(),Mutagenic Cat. 2()
- EU: restricted — Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Product types: Artificial nail systems Maximum concentration: 0.02% (after mixing for use) Other conditions: Professional use Conditions of use and warnings: - For professional use only - Avoid skin contact - Read directions for use carefully CMR: Carcinogenic Cat. 2(),Mutagenic Cat. 2()
- US: commercial use observed — EPA CPDat observed this chemical in 1954 composition records across product categories including Cons. electronics, mech. appliances, and machinery, Laboratory supplies, Specialty occupational products. EPA CPDat classifies this chemical for functional uses including Stabilizing agent, Antioxidant, Fragrance.
- US: marketed drug occurrence — FDA NDC lists this ingredient in 20 active drug products and 22 total products.
- US: listed in openFDA substance — openFDA substance registry classifies this ingredient as chemical.

_Assessed by Greenveil._