Coal Tar: Many kinds of shampoo designed to treat dandruff & flaky scalp contain it. Disguised with names FD, FDC or FD&C color. Coal tar causes potentially severe allergic reactions, asthma attacks, fatigue, nervousness, headaches, nausea, lack of concentration, and cancer.

Cocomide DEA: Mostly found in shampoo. Contains nitrosamines that are known carcinogens causing allergic reactions and contact dermatitis. Synthetic nonionic surfactant. Nitrosamines can form in all cosmetic ingredients containing amines and amino derivatives with nitrogen compounds. When DEA is applied to skin known carcinogens can form.

Cocomidopropyl Betaine: Used in shampoo in combination with other surfactants. Synthetic. Causes eyelid dermatitis.

Carbomer 934, 940, 941, 960, 961 C: Used as a thickener and stabilizer in creams, toothpaste, eye makeup, bathing products. It is a known allergen that has a high acidic PH in 1% water solution. Synthetic emulsifier that can cause eye irritations and should be avoided.