Dimethicone vs Lanolin: 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 Lanolin?

Lanolin is a waxy substance secreted by the sebaceous glands of wool-bearing animals (sheep). It is extracted from raw wool during washing and consists of complex mixtures of esters, diesters, and hydroxy esters of fatty acids and alcohols. It is highly occlusive and closely mimics human sebum.

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.

Lanolin: Lanolin is broadly safe for cosmetic use. It is FDA-approved as a skin protectant in OTC products. The primary concern is contact allergy: approximately 1–2% of the general population and up to 5–8% of eczema patients are sensitized to lanolin alcohols (the allergen fraction). Purified lanolin and lanolin alcohols in modern formulations have lower allergenicity than historical crude grades. Lanolin is not a carcinogen, hormone disruptor, or systemic toxin. It is not vegan.