Trimethylsiloxyamodimethicone

Trimethylsiloxyamodimethicone is an amine-functional silicone used primarily as a hair/skin conditioning and film-forming agent, typically at low percentages in rinse-off and leave-on products. Silicones are generally well tolerated and have low irritancy in patch testing, but the amine-functional modification can very occasionally contribute to mild stinging or reactivity in highly compromised or eczema-prone skin when left on. Given its low inherent reactivity yet non-zero risk in severely sensitized populations, it fits best as very gentle rather than inert. Safety Notes: In commercial rinse-off conditioners, shampoos, and facial cleansers, trimethylsiloxyamodimethicone is often used at very low levels (~0.05–0.3%) as part of a silicone conditioning blend to improve slip and reduce combing force without buildup. In leave-on hair serums/creams and some high-slip styling products, consumer-available formulas commonly run ~0.5–2%, with the highest OTC products reaching about ~3–5% when the silicone polymer is a primary performance driver (often alongside other silicones/emollients). There is no specific FDA/EU maximum for this INCI in cosmetics; practical upper limits are driven by viscosity, compatibility with surfactants/emulsions, and sensory/buildup considerations.