What it is
This is a positively charged (cationic) quaternary ammonium derivative bearing a cinnamic acid amide group. Its positive charge lets it adsorb onto the negatively charged surface of hair, where it reduces static, improves combability, and leaves a smoother feel. In leave-on hair and scalp formulas it functions primarily as a conditioning and antistatic agent rather than as a cleansing or active ingredient.
Safety & warnings
As a quaternary ammonium conditioning agent it is generally well tolerated in rinse-off and leave-on hair products. Because it carries a cinnamic acid moiety, individuals with known sensitivity to cinnamate-type fragrance materials may wish to use caution, though it is used as a functional conditioner rather than a fragrance.
Origin & sourcing
Synthetic; manufactured by quaternization chemistry combining a cinnamic-acid-derived moiety with a propyltrimonium group.
Questions everyone asks
What does cinnamidopropyltrimonium chloride do?
It is a cationic conditioning agent that binds to hair to reduce static and improve smoothness and combability.
Is it a sunscreen filter?
No. It is a hair-conditioning ingredient and provides no UV-filtering function.