Parabens
Concern: Endocrine disruption
Propyl paraben
Isopropyl paraben
Butyl paraben
Isobutyl paraben

Formaldehyde and formaldehyde-like chemicals
Concern: cancer, sensitization
Formaldehyde
Methylene glycol

Formaldehyde releasers
Concern: Contact dermatitis
DMDM hydantoin
Imidazolidinyl urea
Diazolidinyl urea
Quaternium-15
Bronopol (2-bromo-2-nitropropane-1,3-diol)
5-Bromo-5-nitro-1,3-dioxane
(sodium) Hydroxymethylglycinate
Polyoxymethylene urea
Methenamine
Glyoxal

Isothiazolinones
Concern: Contact dermatitis
Methylchlorylisothiazolinone
Methylisothiazolinone
Benzoisothiazolinone

Retinyl Palmitate/Retinoids
Concern: phototoxicity

Lead acetate
Concern: cancer, reproductive/developmental toxicity
Triclosan

Triclocarban
Concern: endocrine disruption, ecotoxicity

Toluene
Concern: reproductive and developmental toxicity, respiratory irritation

Phenacetin
Concern: cancer

Thimerosal
Concern: developmental neurotoxicity

Ethanolamines
Concern: asthma, for DEA cancer, reproductive and developmental toxicity.
Monoethanolamine
Diethanolamine
Triethanolamine

2-butoxyethanol
Concern: respiratory and hematopoietic toxicity

Octyl methoxycinnamate (OMC)
Oxybenzone (benzophenone-3)
Concern: endocrine disruption

Hydroquinone
Concern: suspected carcinogen, kidney damage in animals

Styrene
Concern: cancer
Triphenyl phosphate
Concern: endocrine disruption

Cocamide DEA
Concern: cancer (prop 65 listed, concern likely due to DEA contamination)

BHA
BHT
Concern: cancer and developmental effects in animals

Propyl gallate
Concern: incomplete data on reproductive toxicity, some evidence of
endocrine disruption

Carbon black
Concern: cancer, contamination with petrochemicals such as PAHs

Nitro- and polycyclic musks
Concern: endocrine disruption

Musk xylene
Musk ketone
Musk ambrette (synthetic)
Galaxolide
Tonalide
Phantolide
Celestolide
Traseolide
Versalide
Cashmeran

Animal-derived ingredients
Concern: animal welfare
Emu oil
Equine oil
Mink oil

Bithionol
Concern: photosensitization

Chloroform
Concern: cancer

Halogenated salicylanilides
di-, tri-, metabromsalan and tetrachlorosalicylanilide
Concern: dermal toxicity

Hexachlorophene
Concern: neurotoxicity

Mercury compounds
Concern: neurotoxicity

Methylene chloride
Concern: cancer

Vinyl chloride
Concern: cancer
Zirconium-containing complexes
Concern: respiratory and dermal toxicity

Phthalates 
Concern: Endocrine disruption/developmental/repro toxicity
Dibutyl phthalate
Dimethyl phthalate
Butylbenzyl phthalate
Diethyl phthalate