Researched by Helena DeMaria-Williams
Formula IngredientEmollientDimethicone
INCI: Dimethicone
Dimethicone (also known as polydimethylsiloxane or PDMS) is a synthetic silicone polymer and one of the most widely used emollients in cosmetics, appearing in around 16% of all formulations. It works by forming a lightweight, air-permeable film on the skin surface that locks in moisture and prevents trans-epidermal water loss, without blocking sweat or sebum. Its large molecular size means it sits on top of skin rather than penetrating deeply, making it extremely well tolerated.
Category
Emollient
Irritation Risk
Low
Skin Types
all skin types, dry, oily, combination, sensitive, acne-prone, mature skin
What does this do in a formula?
moisture retention, skin barrier protection, smooth skin texture, non-greasy feel, helps distribute sunscreen actives evenly, temporarily fills fine lines
Is Dimethicone safe? Key considerations
Can Dimethicone cause irritation?
Low RiskIrritation rating of essentially 0 — one of the least irritating cosmetic ingredients. The CIR Expert Panel concluded dimethicone is safe at current concentrations of use. Not subject to any EU CosIng Annex II or III restrictions. Inert and non-reactive with skin. No known contact allergy concerns.
Does Dimethicone increase sun sensitivity?
No RiskDimethicone does not increase photosensitivity. No sun protection precautions are required based on its presence in a formulation.
Is Dimethicone safe during pregnancy?
SafeDimethicone is considered safe during pregnancy. Its large molecular size prevents significant systemic absorption through topical use, so it does not pose a risk to the developing fetus. It is also used as a first-line topical treatment for head lice in pregnant women (UK guidelines), with no trimester-specific restrictions.
How does Dimethicone work?
Dimethicone (also known as polydimethylsiloxane or PDMS) is a synthetic silicone polymer and one of the most widely used emollients in cosmetics, appearing in around 16% of all formulations. It works by forming a lightweight, air-permeable film on the skin surface that locks in moisture and prevents trans-epidermal water loss, without blocking sweat or sebum. Its large molecular size means it sits on top of skin rather than penetrating deeply, making it extremely well tolerated.
Individuals with known silicone allergy (rare) should review the considerations above before use.
Which products contain Dimethicone?
Shop products that contain Dimethicone
Exosome Glow Serum
Dewy Sunscreen SPF 30
360° Skin Clearing Serum
Retinol Serum
Brighten-i Eye Cream
Polyglutamic Acid Serum
Vitamin C Serum
UV Filters SPF 45 Serum
