What Dimethicone does
It creates a semi-occlusive layer that slows water loss without the heaviness of petrolatum, and it fills in surface texture optically.
It is inert, non-reactive and one of the least allergenic ingredients in cosmetics, which is why it appears in barrier creams and eczema products.
Worth using if…
- Rough texture and makeup grip
- Barrier support without greasiness
- Sensitive skin
Safety & watch-outs
- It does not 'suffocate' skin — that claim has no basis — but it can trap other ingredients underneath it.
- Some people find it pills under sunscreen or makeup.
Dimethicone in pregnancy: Not on standard avoid lists
Not on standard pregnancy avoid lists.
Fungal acne (): does not feed it
Silicone, not a lipid. The fungal-acne yeast feeds on fatty acids roughly C11–C24 and the esters built from them, so what matters in a finished formula is the whole list, not one ingredient.
Check a whole formula for malassezia triggers →Comedogenic rating: 1/5 · low risk
Rated low; the 'silicones cause acne' claim is not supported. Ratings come from the published Fulton scale, which was measured on rabbit ears rather than human faces — treat it as a rough signal, not a verdict on a finished formula.
Check a whole formula for pore cloggers →Common questions
Do silicones clog pores?
The molecule is too large to enter pores. Congestion is far more likely to come from oils or waxes in the same formula.
Informational only, not medical advice. Written from public regulatory and dermatology references (EU Cosmetics Regulation annexes, SCCS opinions, CIR reviews, published Fulton-scale data). Concentration, formula and your own skin all change the outcome — consult a clinician for personal concerns.
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