Aluminium chlorohydrate: suspected to be cancer-causing. It is commonly used in deodorant to block perspiration.

Cocamide DEA (cocamide diethanolamine): suspected to be cancer-causing. It is commonly used in shampoos and soaps as a foaming agent.

Diethyl phthalate (DEP): suspected to cause cancer, asthma, and birth defects. It is commonly used in fragrances and nail polish. Phthalates are oily, odorless, colorless, and do not evaporate easily.

DMDM hydantoin: suspected to be cancer-causing. It is commonly used as a preservative and slowly releases formaldehyde.

Parabens (butyl, isobutyl, methyl, ethyl, propyl, benzylparaben): suspected of causing cancer and birth defects. They are commonly used in skin, hair, and body care products as a preservative.

Paraffin: suspected to cause asthma, cancer, birth defects, as well as nerve, liver, and brain damage. Derived from petroleum (crude oil), it does not allow for moisture or air to move freely in the skin.

PEG (polyethylene glycol): derived from a toxic gas, it is commonly used in toothpaste to keep its consistency.

Phenoxyethanol: a much debated ingredient, it is commonly used as a preservative in sunscreens and face creams.

Propylene Glycol: suspected to cause skin sensitivity and birth defects, it is commonly used as a product moisturizer.

Silicone (dimethicone, cyclomethicone): this non-biodegradable polymer is commonly used in hair-care products as a water-repellent.

Sodium dodecyl sulfate, sodium laureth sulfate: classified by the FDA as irritants, and often lead to skin or eye irritations. They are detergents commonly used as foaming agents in personal care products.