What Is Ceteareth-20? Skincare Ingredient Explained

Is Ceteareth-20 Safe? Uses in Skincare Explained

Short answer: yes, for most skin. Ceteareth-20 is a widely used emulsifier — the ingredient that keeps oil and water from separating in creams and lotions. It's considered safe by the Cosmetic Ingredient Review panel, though it's not one we use in our own formulas. Here's what it actually does, and why some brands (including us) leave it out.

What is Ceteareth-20?

Ceteareth-20 is made by combining cetearyl alcohol — a blend of cetyl and stearyl alcohol, both derived from natural fatty acids — with ethylene oxide, in a process called ethoxylation. The "20" refers to the number of ethylene oxide units in the molecule. It's a synthetic ingredient, not a naturally occurring one, though its starting material comes from natural fats.

You'll find it in moisturisers, cleansers, conditioners, sunscreens, and a lot of anti-ageing treatments. It's one of the most common emulsifiers in the industry for a reason: it works.

What does it do in a formula?

Ceteareth-20 does two jobs. As an emulsifier, it binds oil and water together — without it, those two phases would separate, the way oil and vinegar do if you leave a dressing sitting too long. As a mild surfactant, it also helps lift dirt and oil off skin, which is why you'll see it in cleansers as well as leave-on products.

The practical effect: smoother texture, a longer shelf life, and a formula that stays stable instead of splitting.

Is Ceteareth-20 comedogenic?

It's generally rated low on the comedogenic scale and isn't considered a common cause of clogged pores or breakouts for most people. It's not typically the ingredient behind a reaction if you're breaking out — but everyone's skin is different, and if you've had irritation from a product containing it before, that's worth flagging to your dermatologist rather than assuming it's fine to retry.

Is Ceteareth-20 safe?

The Cosmetic Ingredient Review (CIR) Expert Panel has assessed Ceteareth-20 and found it safe for use in cosmetics at typical concentrations. That's a genuine, evidence-based safety finding — not a marketing claim.

The one caveat dermatologists raise: if your skin is already compromised, reactive, or highly sensitive, any surfactant-emulsifier — Ceteareth-20 included — has more potential to aggravate it. That's not unique to this ingredient; it's true of most functional ingredients in that category.

Why we don't use it

Ceteareth-20 isn't part of how we formulate. Our creams and masks use Cetearyl Olivate and Sorbitan Olivate instead — an olive-derived emulsifier system that does the same job without ethoxylation. It's what holds the texture together in the Antioxidant Moisturiser, Retinol Eye Cream, Acai Clay Mask, and Coco Clay Scrub.