Banned ingredient library

Cosmetic ingredients banned or severely restricted by major regulators. Any EU-banned ingredient in a product automatically scores it 0.

Formaldehyde

Preservative

EUHealth CanadaASEAN

Known human carcinogen; banned in cosmetics in the EU (Annex II).

Also: formaldehyde, methylene glycol, methanediol, formalin

Quaternium-15

Formaldehyde releaser

EU

Releases formaldehyde; prohibited in EU cosmetics since 2017.

Also: quaternium-15, quaternium 15

DMDM Hydantoin

Formaldehyde releaser

EU

Formaldehyde donor; restricted/prohibited in EU leave-on uses.

Also: dmdm hydantoin

Methylene Chloride

Solvent

EUFDASABS

Carcinogen and CNS depressant; banned in cosmetics.

Also: methylene chloride, dichloromethane

Lead Acetate

Colorant (hair dye)

EUFDAHealth CanadaSABS

Heavy-metal neurotoxin; banned in hair dyes.

Also: lead acetate

Coal Tar

Colorant

EU

Contains carcinogenic PAHs; prohibited in EU cosmetics.

Also: coal tar

Hydroquinone

Skin lightener

EUASEANSABS

Banned in EU cosmetics (allowed only in regulated nail systems). South Africa prohibits >2% hydroquinone in skin lighteners under Foodstuffs, Cosmetics & Disinfectants Act regulations.

Also: hydroquinone

Mercury & compounds

Heavy metal

EUFDAHealth CanadaSABS

Highly toxic; banned in cosmetics worldwide, including South Africa (Dept. of Health R.1469 cosmetic restrictions).

Also: mercury, thimerosal, mercuric, phenylmercuric

Triclosan

Antimicrobial

EU

Restricted in EU; banned in rinse-off products at >0.3% and many uses prohibited.

Also: triclosan

Triclocarban

Antimicrobial

EUFDA

Endocrine disruptor; banned in many cosmetic applications.

Also: triclocarban

Methylisothiazolinone (leave-on)

Preservative

EU

Strong skin sensitizer; banned in leave-on cosmetics in the EU.

Also: methylisothiazolinone

Methylchloroisothiazolinone (leave-on)

Preservative

EU

Sensitizer; banned in leave-on cosmetics in the EU.

Also: methylchloroisothiazolinone

Butylparaben (children's leave-on)

Preservative

EU

Long-chain parabens banned in EU cosmetics due to endocrine concerns.

Also: butylparaben, isobutylparaben, isopropylparaben, pentylparaben, phenylparaben, benzylparaben

Resorcinol (high conc.)

Hair dye intermediate

EU

Endocrine disruptor; banned above strict limits in EU hair products.

Also: resorcinol

Toluene

Solvent

EU

Reproductive toxin; banned in EU cosmetics outside narrow nail uses.

Also: toluene

Phenylenediamine (PPD, high conc.)

Hair dye

EU

Severe sensitizer; banned above strict limits in EU hair dyes.

Also: p-phenylenediamine, phenylenediamine

Diethanolamine (DEA)

Surfactant / pH adjuster

EU

Can form carcinogenic nitrosamines; banned in EU cosmetics.

Also: diethanolamine, cocamide dea, lauramide dea

Hexachlorophene

Antimicrobial

EUFDASABS

Neurotoxic; banned in cosmetics.

Also: hexachlorophene

Selenium sulfide (high conc.)

Anti-dandruff active

FDA

OTC-drug regulated; above 1% (rinse-off) / 0.6% (leave-on) prohibited.

Also: selenium sulfide, selenium sulphide

Bithionol

Antimicrobial

FDAEUSABS

Photosensitization risk; banned in cosmetics.

Also: bithionol

Monobenzone

Skin lightener

SABSEUFDA

Causes permanent depigmentation; banned in South African cosmetics under SABS / Dept. of Health cosmetic regulations.

Also: monobenzone, monobenzyl ether of hydroquinone

Chloroform

Solvent

SABSEUFDA

Carcinogen; prohibited in cosmetics in South Africa and aligned markets.

Also: chloroform, trichloromethane

Strontium sulphide / sulfide

Depilatory agent

SABSEU

Restricted in South African cosmetics; only permitted in regulated depilatory products within strict pH and concentration limits.

Also: strontium sulfide, strontium sulphide

Steroids in cosmetics (e.g. clobetasol, betamethasone)

Pharmaceutical actives

SABS

Corticosteroids are scheduled medicines in South Africa and may not be added to cosmetic products; common adulterant in illegal skin-lightening creams.

Also: clobetasol, betamethasone, hydrocortisone, dexamethasone

Tretinoin (in cosmetics)

Pharmaceutical actives

SABS

Schedule 4 medicine in South Africa; prohibited as a cosmetic ingredient and frequently flagged in illegal lightening products.

Also: tretinoin, all-trans retinoic acid

Carbon tetrachloride

Solvent

SABSEU

Hepatotoxic and ozone-depleting; prohibited in cosmetics in South Africa.

Also: carbon tetrachloride, tetrachloromethane

Representative reference list — not an exhaustive legal source. Always consult the official regulator (e.g. EU Cosmetics Regulation Annex II) for compliance.