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1. Acrylic Acid – respiratory toxin for humans; causes asthma, severe skin burns, and allergic reaction in the skin or lungs; causes renal and kidney damage in animals; causes blood tumors and skin tumors in animals.
2. Aluminum (pure aluminum powder) - strong human neurotoxicant; causes irritation of eyes, skin, and lungs; endocrine disruptor; linked to Alzheimer’s disease and breast cancer; causes birth disorders in animals.
3. Aluminium Chloride – nose and lung irritant; causes liver and bladder abnormalities in animals; causes brain disorders in animals; human endocrine disruptor linked to breast cancer and Alzheimer’s disease; aluminum compounds are generally neurotoxic to humans.
4. Aluminium Hydrochloride – endocrine disruptor linked to breast cancer and Alzheimer’s disease; aluminum compounds are neurotoxic to humans.
5. Aluminium Oxide – strong nose and lung irritant; causes skin cancer in animals; endocrine disruptor linked to breast cancer and Alzheimer’s disease; aluminum compounds are neurotoxic to humans.
6. Ammonium Laureth Sulfate – causes skin irritation, water contaminant, may be contaminated with carcinogen 1,4-Dioxane.
7. Ammonium Persulfate – strong eyes, respiratory system and skin irritant; can trigger asthma; restricted in cosmetics.
8. Amyl Acetate – neurotoxin; eye and lung irritant; lung allergen.
9. Benzalkonium Chloride  – immune system, lung and skin toxicant; can trigger asthma; restricted in Canada and Japan.
10. Benzyl Alcohol - strong neurotoxicant; can cause allergic reaction in lungs; causes itching, burning, scaling, hives, and blistering of skin; caused liver damage, coma and death in animals.
11. Boric Acid – strong reproductive toxin; potent endocrine disruptor; unsafe for use on infant, injured or damaged skin; causes death and birth defects in animals; banned in Canada and Japan.
12. Bronopol (2-bromo-2-nitropropane-1,3-diol) – one of the strongest lung and skin toxicants; endocrine disruptor; forms carcinogenic nitrosamine; causes allergic contact dermatitis environmental contaminant; poisonous to wildlife.
13. Butylated Hydroxyanisole (BHA) -  human carcinogen; caused brain and liver tumors in animals at low doses; endocrine disruptor; causes allergic contact dermatitis and skin depigmentation; banned in European Union; persistent environmental toxin.
14. Butylated Hydroxytoluene (BHT) – endocrine disruptor, skin and lungs toxicant at low doses; caused death, liver and stomach cancers, thrombosis, fibrosis, liver and brain damage in animals; strong skin and eye irritant.
15. Butylene Glycol – skin, lung and eye irritant; environmental toxin.
16. Butylparaben - skin and eye irritant; endocrine disruptor linked to breast and ovarian cancer; environmental contaminant.
17. Calcium Fluoride – neurotoxic to humans; leads to bone weakness; causes birth abnormalities and depression in animals.
18. Ceteareth (with any numeral following it) - unsafe for use on broken skin; eye and lung irritant; may be contaminated with 1,4-Dioxane.
19. Cetrimonium Chloride - skin and eye sensitizer that can include itching, burning, scaling, hives, and blistering; caused cell mutations in animal studies.
20. Cetyl alcohol - skin and eye irritant in humans.
21. Cetrimonium Chloride – can cause itching, burning, scaling, hives, and blistering of skin; caused lung cancer in animals.
22. Chloroacetamide - strong skin, eye, and lung irritant; toxic if inhaled; causes paralysis, goiter, and birth defects in animals; banned in Canada.
23. Coal Tar – known human carcinogen; causes lung and urinary tract cancer; potent skin irritant; causes multiple cancers in animals; banned in most countries including Canada and European Union; still used in anti-dandruff shampoos in the US and the U.K.
24. Cocamide DEA (ethanolamide of coconut acid) – strong human skin toxicant and suspected carcinogen; causes irritation of skin, eyes, and lungs in humans; causes liver and bladder cancer in animals.
25. D&C Red 30 Lake - strong nervous system toxicant; as an aluminum compound, disrupts endocrine system and linked to breast and ovarian cancer; persistent wildlife contaminant.
26. D&C Violet 2 - coal tar dye; skin and eye irritant; long-time use of coal tar hair dye linked to bladder cancer.
27. Dibutyl phthalate - neurotoxicant, linked to impaired fertility and urinary abnormalities, linked to breast and ovarian cancers, contaminates wildlife.
28. Diethanolamine (DEA) – linked to brain abnormalities in animals; may be contaminated with carcinogen 1,4-Dioxane.
29. Dimeticone  (dimethicone) – petroleum derivative, environmental toxicant.
30. Direct Black 38 - diethanolamine-containing dye that is a confirmed human carcinogen; strong evidence of causing bladder cancer; may harm unborn child; causes liver and kidney cancer in animals; banned in European Union.
31. DMDM Hydantoin - contains carcinogenic Formaldehyde; skin, eye and lung irritant; environmental toxicant.
32. Ethylparaben - skin and eye irritant; endocrine disruptor linked to breast and ovarian cancer; environmental contaminant.
33. Eugenol - endocrine disruptor, skin, eye and lung irritant; well-recognized consumer allergen;  caused death, coma, insomnia, convulsions, hematuria, pulmonary edema and liver cancer in animals.
34. Ext. D&C Violet 2 – this coal tar dye is a strong skin irritant; long-time use of coal tar dyes is linked to increased risk of bladder cancer; this dye is restricted in cosmetics.
35. FD&C Blue 1 - derived from coal tar; linked to allergies and hyperactivity disorders.
36. FD&C Green 3 - causes sarcomas and bone marrow hyperplasia in animals; not studied for safety in humans; prohibited in European Union.
37. FD&C Yellow 5 (E104, tartrazine) – causes severe allergic and intolerance reactions, especially among asthmatics and those with an aspirin intolerance; linked to thyroid tumors, chromosomal damage, hives, and hyperactivity in humans.
38. FD&C Yellow 5 Aluminum Lake -  aluminum compounds are neurotoxic to humans.
39. FD&C Yellow 6 - human skin and eye irritant; caused coma, convulsions, testicular damage, and changes in leucocytes in animals; cannot be used in eye cosmetics
40. Fig (Ficus Carica) Extract – immune system toxin; cannot be used as fragrance ingredient due to potential carcinogenicity; banned in European Union; allowed in the US as fragrance ingredient in shampoos and body washes.
41. Formaldehyde - known human carcinogen linked to leukemia, pancreatic, skin, liver, and lung cancer; strong skin, eye, and lung irritant; irritates human liver (causes cirrhosis), stomach, kidneys, and bladder; can cause skin burns; triggers asthma; hazardous air pollutant; environmental toxin; banned in Canada and Japan; determined as safe for use in cosmetics in the US.
42. Formaldehyde Resin - contains Formaldehyde and carries same risks; can trigger allergic reaction in the skin or lungs.
43. Formaldehyde Solution (Formalin) - linked to leukemia, nasal and nasopharyngeal cancer; neurotoxin in humans and animals; linked to bladder and liver cancer; restricted in Canada and European Union known human carcinogen linked to leukemia, pancreatic, skin, liver, and lung cancer; strong skin, eye, and lun irritant; irritates human liver (causes cirrhosis), stomach, kidneys, and bladder; can cause skin burns; triggers asthma; hazardous air pollutant; environmental toxin; banned in Canada an Japan; determined as safe for use in cosmetics in the US.
44. Glyceryl Stearate – weak skin, eye and lung irritant.
45. Iodopropynyl Butylcarbamate - contains Diethanolamine; can affect thyroid function; gastrointestinal or liver toxicant; cannot be used in aerosols; causes allergic contact dermatitis; restricted in Japan.
46. Imidazolidinyl Urea (Uric Acid) – can cause itching, burning, scaling, hives, and blistering of skin.
47. Isobutylparaben – skin and eye irritant; endocrine disruptor linked to breast and ovarian cancer; environmental contaminant.
48. Isoparaffin – petroleum derivative; environmental toxin; mildly irritating; produced kidney damage in animals; not carcinogenic in humans.
49. Isopropyl Alcohol (SD-40) - human neurotoxin; skin, eye, and lung irritant; vapors cause drowsiness and dizziness; causes skin dehydration, may promote brown spots and premature aging of skin; petroleum derivative.
50. Hydroquinone - eye, lungs, and nervous system toxin; can cause itching, burning, scaling, hives, and blistering of skin; suspected liver and stomach carcinogen; causes liver cancer, DNA and ovary mutations in animals; restricted in Canada.
51. Lactic acid – strong skin and eye irritant; can cause skin burns; causes changes in liver, brain and blood in animals; caused mutations and birth defects in animals; restricted in Canada.
52. Lanolin - strong skin irritant and toxicant; can cause allergic reaction in the lungs.
53. Laureth-7 (polyethylene glycol ether of lauryl alcohol) – may be contaminated with carcinogen 1,4-Dioxane.
54. Lead acetate – possible human carcinogen and neurotoxin; skin and eye irritant; environmental toxin; banned in the European Union.
55. Lecithin - can irritate lungs in aerosol form; a potent asthma trigger; forms carcinogenic nitrosamine compounds if mixed with nitrosating agents.
56. Manganese Sulfate -  strong human neurotoxin; harmful during prolonged exposure or inhalation; causes convulsions, DNA mutations, and protein loss in animals; toxic to wildlife.
57. Methamine - strong skin, eye, nose, and lungs irritant; can cause itching, burning, scaling, hives, and blistering of skin; may be contaminated with carcinogenic 1,4-Dioxane; cannot be used in aerosol cosmetics.
58. Methyl Methacrylate - strong neurotoxin; strong eye and lung irritant; causes asthma and skin burns; causes cancer and stomach bleeding in animals; hazardous air pollutant; banned in Canada and in the US.
59. Methylparaben - skin and eye irritant; endocrine disruptor linked to breast and ovarian cancer; environmental contaminant.
60. Mineral oil (liquid petrolatum) - caused blood and skin cancer formations in animals; eye and skin irritant; derived from petroleum; non-biodegradable environmental toxin.
61. Monoethanolamine (MEA) - skin and eye irritant at low doses, can be irritating to the respiratory tract.
62. Nonoxynol (ethoxylated alkyl phenol) – endocrine disruptor; skin and lung irritant; caused liver damage in animals; may be contaminated with 1,4-Dioxane.
63. Octoxynol (10, 11, 13, 40) – strong skin and eye toxin that can cause itching, burning, scaling, hives, and blistering of skin; may contain carcinogen 1,4-Dioxane; caused cancer of reproductive organs in animals.
64. Oxybenzone (benzophenone-4) – strong photoallergen, endocrine disruptor; produces free radicals that can increase skin aging; environmental toxicant.
65. Padimate O (Octyl Dimethyl PABA/PABA Ester) – has estrogenic activity; releases free radicals that damages DNA when exposed to sunlight; causes allergic reactions and photoallegenic dermatitis; restricted in Japan.
66. Para Amino Benzonic Acid (PABA)  - causes allergic dermatitis and photosensitivity; produces free radicals that cause mutations, lead to cell death and may be implicated in cardiovascular disease; causes changes in blood components and muscle weakness in animals; banned in Canada.
67. Paraffin (parrafinum liquidum, paraffin petrolatum) - petrochemical bleached with carcinogen acrolyn; releases carcinogens benzene and toluene upon heating; caused kidney or renal system tumor in animals; environmental toxin.
68. PEG-100 Stearate - polyethylene glycols are often contaminated with 1,4-Dioxane; suspected endocrine disruptor; linked to cancer in animals; skin and eye irritant.
69. Petrolatum (soft paraffin, white petrolatum, petroleum jelly) - lung irritant upon inhalation; derived from petroleum; non-biodegradable environmental toxin.
70. Phenol – strong respiratory irritant; toxic by skin contact, causes skin burns; causes kidney damage and cyanosis in humans; causes skin cancer, birth defects, brain and nervous system damage in animals at very low doses; environmental contaminant; banned in Canada, restricted in Japan, permitted in the US.
71. Phenoxyethanol - endocrine disruptor and carcinogen in animals; linked to allergic contact uritica and dermatitis.
72. Picric acid - human immune system toxicant; toxic by inhalation, skin contact, and ingestion; causes allergic reaction in the skin or lungs; causes coma, convulsions, body temperature increase in animals; banned in Canada and European Union.
73. Placental Extract – endocrine disruptor containing estradiol and progesteron; banned in Canada.
74. Polyethylene Glycol (PEG) - often contaminated with carcinogenic 1,4-Dioxane; suspected endocrine disruptor; linked to cancer in animals; skin and eye irritant.
75. Polyethylene Terephthalate – causes cancer in animals; not studied for safety in humans.
76. Polysorbate 80 - contaminated with 1,4-Dioxane; suspected endocrine disruptor; linked to cancer in animals; skin and eye irritant.
77. Potassium Persulfate - strong irritant to eyes, lungs, respiratory system and skin; restricted for use in cosmetics.
78. P-phenylenediamine - linked to bladder and prostate cancer; human neurotoxin; skin and lung irritant; causes liver cancer and birth defects in animals; very strong environmental toxin.
79. Propyl Acetate – skin, eye, nose and lung irritant.
80. Propylene glycol (PG) can cause eye irritation and conjunctivitis, as well as upper respiratory tract irritation.
81. Propylparaben - skin and eye irritant; endocrine disruptor linked to breast and ovarian cancer; environmental contaminant.
82. Resorcinol (m-hydroquinone, euresol, 1,3-benzenediol) – strong skin irritant, linked to adenomas in animals, suspected to trigger skin cancer in humans, environmental toxin.
83. Quaternium-7, 15, 31, 60 - formaldehyde releasing; can cause skin and eye irritation; linked to several cancers (see Formaldehyde)
84. Saccharin – suspected human carcinogen; causes liver, kidney and bladder damage in animals, as well as reproductive damage and birth abnormalities, during numerous studies.
85. Silica - linked to esophageal cancer, renal disease, pulmonary fibrosis, mesothelioma, sarcoma, rheumatoid arthritis, bronchitis; strong nasal and lung irritant; wildlife toxicant; accumulates in human body.
86. Sodium Metabisulfite - immune system toxicant; eye and skin irritant; emits toxic gas when contacts with acids; dangerous for asthmatics; causes stillbirth, muscle weakeness and brain degeneration in animals.
87. Sodium Methylparaben – endocrine disruptor; caused mild brain damage in animals; skin irritant causing itching, burning, scaling, hives, and blistering of skin; causes depigmentation of skin; banned for use in EU.
88. Sodium  Monofluorophosphate - nervous system toxin; harmful if swallowed during teeth bleaching; causes convulsions, proteinuria, osteoporosis and changes in DNA in animals; restricted in Canada.
89. Sodium Laureth Sulfate - skin irritant, water contaminant, may be contaminated with carcinogen 1,4-Dioxane.
90. Sodium Lauryl Sulfate - skin and eye irritant, in toothpaste may cause canker sores.
91. Talc - even when it contains no asbestos, was proven fibrogenic (causes tissue injury and fibrosis), skin and lung irritation.
92. Teflon – causes toxic pneumonitis and skin cancer in animals; no studied for safety in humans.
93. Tetrasodium EDTA - contains formaldehyde; cytotoxic and genotoxic in animals; strong skin and lung irritant in humans; most widespread poison to waterways.
94. Thimerosal (Thiomersal, Merthiolate) – strong oxin to skin, nervous and immune system; mercury is linked to autism; causes cancer in animals; environmental toxin.
95. Thioglycolic Acid (contains mercury) – strong human skin irritant; causes itching, burning, scaling, hives, and blistering of skin; lung allergen; restricted in cosmetics; banned in Canada
96. Toluene (methylbenzene) - skin and lung toxicant; carcinogen; accumulates in fat tissue; soil contaminant.
97. Triclosan – endocrine disruptor, affects thyroid hormone-associated gene expression, caused fetal death in animals; strong skin irritant; environmental toxicant
98. Triethanolamine (TEA) – causes lymphoid, kidney and renal tumors in animals; may be contaminated with carcinogen 1,4-Dioxane; skin and eye irritant even when used in low doses.
99. Triphenyl  Phosphate – human neurotoxin; skin, eye and lung irritant; causes tremors, depression, and diarrhea in animals.
100. Xanthene (AKA106, CI 45100) – found unsafe for use in cosmetics in the US; caused cancer and various organ mutations in animals.

Sources:
Cosmetic Ingredient Review (CIR); Environmental Protection Agency (EPA); European Union: Classification & Labelling; Health Canada: List of Prohibited and Restricted Cosmetic Ingredients; EPA Water Quality Standards Database; EPA Hazardous Air Pollutants; National Library of Medicine; CHE Toxicant and Disease Database; Scorecard.org Toxicity Information; U.S. Association of Occupational and Environmental Clinics; International Agency for Research on Cancer (IARC).