What it is
Tris(Tetramethylhydroxypiperidinol) Citrate is the citric acid triester of a tetramethylhydroxypiperidinol, a hindered-amine structure of the type used to scavenge free radicals. In cosmetic products it functions as an antioxidant that helps protect the formulation and skin surface from oxidative stress. It is used at low levels as part of a stabilizing or antioxidant system.
Safety & warnings
Used at the low levels typical of antioxidants, it is generally considered well tolerated. It is not a recognized fragrance allergen.
Origin & sourcing
It is a synthetic compound produced by esterifying citric acid with a hindered-amine piperidinol.
Questions everyone asks
What is the role of this ingredient in skincare?
It acts as an antioxidant, helping protect the formulation and skin from oxidative stress caused by free radicals.
Is it a UV filter?
No, it is an antioxidant and stabilizer rather than a sunscreen UV filter.