An ammonium salt used in many cosmetics. It is toxic. Causes eye irritations, hair loss, scalp scales similar to dandruff, and serious allergic reactions. Examples are cetrmonium bromide and cetylpyridinium chloride, which are used as detergents and topical antiseptics in various cosmetics. Avoid.

Quaternium (Wikipedia)

Look up quaternium in Wiktionary, the free dictionary.

Quaternium may refer to:

• Polyquaternium
• Quaternium-15
• quaternary ammonium, functional group, cation, salt, compound