Hydrated Silica
Hydrated silica
- Role
- A mineral absorbent powder that helps the base stay dry to the touch.
- Catalog formulas
- 3
- Type
- Texture
- Verified
- 06.11.2026
What does this ingredient do in an antiperspirant?
According to CosIng, Hydrated Silica is silicic acid, a synthetic amorphous silicon dioxide. Its functions are absorbent, bulking, anticaking, opacifying and viscosity controlling.
Part of a system, not a label in isolation
In antiperspirant sticks it absorbs moisture and oils from the base and reduces the sticky feel. It does not reduce sweating.
In 2025 CIR concluded that synthetically manufactured amorphous Silica and Hydrated Silica are safe in the present practices of use and concentration when formulated to be non-irritating.
It is usually not irritating to the skin; the CIR conclusion assumes the finished formula is designed to be non-irritating.
Hydrated Silica is not the same as Silica: it is a separate INCI entry in an ingredient list. Do not confuse it with silicones such as Dimethicone either.
Products containing Hydrated Silica
Links are based on the complete published INCI list for the exact product version.
Sources
The conclusions apply to the stated conditions and jurisdictions, not automatically to every concentration or product.
- EU CosIng: Hydrated Silica Supports: function, substance identity
- CIR: synthetically manufactured amorphous Silica and Hydrated Silica (2025) Supports: safety assessment, conditions of use