Dimethicone vs Paraffinum Liquidum: which is worse?

What is Dimethicone?

Dimethicone is a silicone polymer (polydimethylsiloxane) that exists as a clear, odorless oil or gel depending on molecular weight (viscosity grades 50–12,500 cSt). It is one of the most widely used cosmetic ingredients globally for its unique skin-feel properties.

What is Paraffinum Liquidum?

Paraffinum liquidum is the INCI name for mineral oil — a highly refined, colorless, odorless petroleum-derived hydrocarbon liquid. It has been a staple cosmetic emollient for over a century.

Documented risks

Dimethicone: Dimethicone has an excellent safety record. The CIR has reviewed it extensively and confirmed safety at cosmetic use concentrations. It is non-allergenic, non-comedogenic, and does not penetrate intact skin. It is FDA-approved as an OTC skin protectant (1–30%). Environmental concerns exist because high-molecular-weight dimethicone is not biodegradable and accumulates in aquatic sediments; this is a sustainability concern rather than a human health issue. No carcinogenic or endocrine effects are documented.

Paraffinum Liquidum: Cosmetic-grade paraffinum liquidum (highly refined mineral oil) is considered safe by the CIR and FDA. The EU restricts use based on refining grade, specifically prohibiting inadequately refined mineral oils that may contain carcinogenic PAH compounds. Highly refined grades (used in cosmetics globally) have no identified carcinogenic risk. Mineral oil does not penetrate intact skin and is not absorbed systemically. It is non-comedogenic at low concentrations; higher concentrations may contribute to congestion in acne-prone skin. Inhalation of mineral oil mist in occupational settings is a separate concern not applicable to cosmetic topical use.