Namely
Triethanolamine or more commonly called TEA is a basic tertiary amine. It is often used as a pH adjuster or to thicken cosmetic formulas. Its manufacture results from the reaction of ethylene oxide (very toxic) with ammonia (also toxic).
In the presence of nitrite, TEA forms nitrosamines known to be carcinogenic. Nevertheless, it must be imagined that the risk remains very low in a bathroom. However, beyond this aspect, many studies (including CIR) seem to indicate that TEA is toxic to the skin, the immune system and the respiratory tract in humans. One or more animal studies have shown effects on the sense organs at very low doses, particularly when used around the mouth, eyes and lips, and one or more in vitro tests on mammalian cells have shown positive mutation results.