What does Methyl polysilsesquioxane caffeate do?

Used in cosmetics as an antioxidant and a skin-conditioning agent. Methyl Polysilsesquioxane Caffeate is the polysiloxane formed by the hydrolysis and condensation of Methyltrichlorosilane in water under alkaline conditions, followed by reaction with Caffeic Acid. The solution is then neutralized.

Is Methyl polysilsesquioxane caffeate safe?

We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

beauty

Methyl polysilsesquioxane caffeate

Concern score

Not assessed — no hazard data yet.

Methyl polysilsesquioxane caffeate in plain language

What it does: Used in cosmetics as an antioxidant and a skin-conditioning agent. Methyl Polysilsesquioxane Caffeate is the polysiloxane formed by the hydrolysis and condensation of Methyltrichlorosilane in water under alkaline conditions, followed by reaction with Caffeic Acid. The solution is then neutralized.
Antioxidant
Skin conditioning
Is it a concern?: We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

What we know about this ingredient

Canonical ingredient record built from 1 public-source records.

Regulation

No restrictions found. Methyl polysilsesquioxane caffeate appears in these published regulatory listings.

EUCosIngActiveMethyl Polysilsesquioxane Caffeate is the polysiloxane formed by the hydrolysis and condensation of Methyltrichlorosilane in water under alkaline conditions, followed by reaction with Caffeic Acid. The solution is then neutralized.
- Methyl Polysilsesquioxane Caffeate is the polysiloxane formed by the hydrolysis and condensation of Methyltrichlorosilane in water under alkaline conditions, followed by reaction with Caffeic Acid. The solution is then neutralized.Source →

Expert safety opinions

No expert opinion on file for Methyl polysilsesquioxane caffeate. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.

Evidence & sources

No graded research studies for Methyl polysilsesquioxane caffeate yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

1 data source

Where this comes from

CosIng
regulatory · updated 2026-09-23
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Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.