Cyclomethicone vs Paraffinum Liquidum: which is worse?

What is Cyclomethicone?

Cyclomethicone is a term used for a mixture of cyclic silicones — primarily cyclopentasiloxane (D5) and cyclotetrasiloxane (D4). It is a lightweight, volatile silicone that evaporates from skin and hair after application.

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

Cyclomethicone: Cyclomethicone itself has a good short-term safety profile at cosmetic use levels. However, the EU has restricted specific cyclic silicones D4 (cyclopentasiloxane — now banned from rinse-off in EU) and D5/D6 (≤0.1% in rinse-off products) due to persistence, bioaccumulation, and potential endocrine-disrupting effects in aquatic organisms. Human health risk at cosmetic concentrations is considered low, but regulatory caution is appropriate. D5 has been studied for potential endocrine disruption in animals; evidence for human endocrine effects at cosmetic doses is not established.

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.