Is dimethicone a silicone?

What is the difference between dimethicone and silicone?

Dimethicone is also called polydimethylsiloxane. It is a linear polymer, meaning its repeating chemical units form a chain. Other silicones have different structures: cyclomethicone is cyclic, while silsesquioxanes have cage structures. All dimethicone is silicone, but not all silicone is dimethicone. If you want to avoid silicones, a product listing dimethicone does not meet that preference. The length and molecular weight of dimethicone's chains can change its physical properties, so the name alone does not tell you exactly how a finished cream will feel.1

What does dimethicone do in skincare?

Dimethicone acts as an emollient, an ingredient that softens and smooths skin, and as an occlusive, an ingredient that forms a protective surface layer. It creates a thin, nongreasy film and smooths gaps in the skin's outer layer. Dimethicone is insoluble in water, but its film allows water vapor through. It is used in acne formulations for moisturizing and barrier support without a greasy shine.1

Silicone barrier creams are less greasy than petroleum based ones, while petroleum based products are more effective at limiting water loss. Texture is a practical reason to prefer one cream over another, not an audition for the glossiest finish. A moisturizer can also contain humectants, such as glycerine, which help skin hold onto water.2

How do you use a moisturizer containing dimethicone?

General moisturizer guidance applies: use a leave on cream or lotion immediately after bathing, or at other times when needed. Slightly dry skin may need only a light moisturizer at night; drier skin needs more frequent application. Moisturizer benefits are greatest during the first six hours after application, and regular use two to three times daily can help maximize them. Barrier creams are applied sparingly and reapplied as necessary. The best moisturizer is one you like using, because shelf decoration is a different product category.23

Can a dimethicone cream cause problems?

Dimethicone is classed as noncomedogenic, meaning it does not tend to clog pores, but some occlusive creams can aggravate acne. The whole formula matters. Barrier creams are usually well tolerated, but fragrances, preservatives and other ingredients can cause allergic contact dermatitis, an allergic skin rash. Stop using a moisturizer if that develops; suspected ingredient allergies can be investigated with patch testing. Most barrier creams should not be applied directly to broken skin.123