Silicones In Makeup and Skin Care: Should You Avoid Them?
, by Hello Charlie Blogs, 5 min reading time
Silicones are easy to spot on a beauty label: dimethicone, amodimethicone, cyclopentasiloxane and many other names ending in “-cone” or “-siloxane”. They help sunscreen spread, soften the feel of moisturiser, reduce water loss and give makeup its smooth slip.
Online, they are often accused of suffocating skin, clogging every pore or being “plastic”. Those claims treat a large family of ingredients as if they were one substance. The evidence is more nuanced: commonly used cosmetic silicones are generally considered safe for people at permitted uses, while some volatile cyclic silicones raise legitimate environmental concerns.
Quick answer: you do not need to avoid every silicone for skin-health reasons. Dimethicone is widely used as a skin protectant and is generally well tolerated. If environmental persistence matters to you, pay particular attention to volatile cyclic siloxanes such as D4, D5 and D6 and to credible certification—not generic “silicone-free” marketing.
What are silicones?
Silicones are polymers or smaller molecules built around silicon and oxygen, usually with carbon-containing side groups. Changing their chain length and structure creates materials with very different properties: fluids that evaporate, flexible gums, water-dispersible conditioning agents and protective polymers.
That variety is why “is silicone safe?” is too broad. A useful assessment asks which silicone, in what product, at what concentration, with what human exposure and environmental fate.
Why are silicones used in cosmetics?
- Slip and spreadability: they help makeup and sunscreen form an even film without a greasy feel.
- Skin protection: ingredients such as dimethicone can reduce moisture loss and shield irritated skin from external moisture and friction.
- Hair conditioning: selected silicones reduce combing friction, static and breakage and can improve shine.
- Water resistance: silicone polymers can help sunscreen and makeup remain on the skin.
- Texture: they can blur the look of fine texture and make a formula feel silky.
These are functional benefits, not proof that every formula is suitable for everyone.
Do silicones suffocate the skin?
No. Skin does not breathe like lungs. Oxygen reaches living skin tissue mainly through the blood supply, not from air moving through pores. Many silicones form a water-repellent, breathable film that slows moisture loss without creating an impermeable plastic sheet.
Occlusion exists on a spectrum. Petrolatum is more occlusive than many silicone fluids, and even it is used safely in appropriate skincare. Whether a protective film feels comfortable depends on the whole formula, climate and skin condition.
Do silicones clog pores or cause acne?
Dimethicone is generally considered non-comedogenic and is common in products designed for acne-prone skin. But “non-comedogenic” is not an absolute guarantee: acne can be influenced by the full formula, heavy application, incomplete removal, hormones and individual response.
If a silicone-containing product seems to trigger breakouts, stop it and reintroduce cautiously after the skin settles. That identifies the product as a problem for you; it does not prove the named silicone is the cause. A dermatologist can help with persistent or scarring acne.
Are silicones allergens?
Common high-molecular-weight silicones such as dimethicone have low sensitisation potential, which is one reason they are used in barrier creams and sensitive-skin formulas. Irritation or allergy can still occur from another ingredient in the product—often fragrance, a preservative or a botanical extract.
Patch-test a new product if you have reactive skin. Seek urgent help for facial swelling or breathing difficulty and professional advice for a rash that persists.
Do silicones build up on hair?
Some silicones deposit on hair more readily than others. This can improve smoothness and reduce damage, but repeated use of a heavy conditioning formula may leave fine hair limp or coated. Product amount, hair porosity, water hardness and washing routine all matter.
You do not necessarily need a harsh clarifying shampoo. Start by using less conditioner, applying it mainly to lengths and choosing a formula suited to your hair. Water-dispersible or lighter silicones may suit people who dislike heavier buildup.
The environmental issue: cyclic volatile siloxanes
The strongest reason for silicone scrutiny is environmental, especially for the volatile cyclic siloxanes octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6).
These substances can persist and accumulate in the environment to different degrees. Canada concluded that D4 met criteria for environmental concern while not posing a danger to human health at assessed exposures. European restrictions have targeted D4 and D5 in wash-off cosmetics and expanded controls on D4, D5 and D6 in other uses because of persistence and bioaccumulation—not because every silicone has been shown to harm skin.
Rinse-off and leave-on uses also create different release patterns. A volatile ingredient may evaporate during use, while a wash-off product goes more directly to wastewater. A life-cycle assessment must consider manufacture, use and disposal rather than relying on “natural” or “synthetic” labels.
How to recognise silicones on a label
Common names include:
- dimethicone and dimethiconol;
- amodimethicone;
- cyclopentasiloxane (D5);
- cyclohexasiloxane (D6);
- trimethylsiloxysilicate; and
- silicone quaterniums and PEG-modified dimethicones.
An ending is a clue, not a complete environmental profile. Ask brands for specifics if a claim matters to your purchase.
Should you choose silicone-free products?
Silicone-free is a preference, not a universal health requirement. It may make sense if you dislike the feel, want to simplify a hair routine or follow a certification that restricts particular substances. It does not automatically make a formula safer or more sustainable: replacements can also be persistent, allergenic, resource-intensive or poorly biodegradable.
A balanced buying checklist:
- Judge the whole formula and the product’s purpose.
- For sensitive skin, prioritise fragrance and known personal allergens.
- For environmental concerns, distinguish D4/D5/D6 from polymers such as dimethicone.
- Look for transparent brands or credible third-party standards.
- Stop using any product that consistently causes irritation or breakouts.
Browse Hello Charlie’s natural makeup range or read our Ingredients Policy for our approach to formulation.
Sources and further reading
- Health Canada: Safety of cosmetic ingredients
- Government of Canada: Siloxanes group assessment
- Government of Canada: Environmental quality guidance for D4
- European Commission SCCS: Cyclopentasiloxane (D5)