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Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Ceteareth-20 is an emulsifier and surfactant made by reacting cetearyl alcohol with 20 moles of ethylene oxide.
This gives it both oil and water-loving properties that makes it an effect emulsifier; it's really great at pulling oil droplets into water to create a stable, creamy, and easy-to-spread base.
Typical use ranges from 0.5-30%. Most leave-on products are in the 1-10% zone.
The 20 ethylene oxide units is well above the PEG-10 threshold and therefore not a food source for Malassezia (it's fungal acne safe).
This ingredient has a comedogenic rating of 2 and an irritancy rating of 3. These numbers come from testing the raw ingredient on rabbit ears and doesn't reflect how it will behave in a finished product.
In practice, this ingredient is a well-tolerated ingredient. The ratings reflect cautious lab conditions and not real-world use. Just be sure to patch test any formulas you feel unsure about.
Learn more about Ceteareth-20Cetearyl alcohol is a waxy mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is an emollient and emulsifier.
Despite having "alcohol" in its name, it has nothing to do with drying solvent alcohols; the FDA also allows "alcohol-free" products to contain fatty alcohols like this ingredient.
It plays several roles in a formula:
Typical use levels for this ingredient sit around 1-10% and the Cosmetic Ingredient Review Expert Panel has affirmed safety at concentrations up to 25% in leave-on products.
Multiple assessments have found it to be non-irritating and non-sensitizing to most people.
However, there have been some cases of allergic contact dermatitis in patients with chronically compromised skin barriers.
Cetearyl alcohol has a comedogenic rating of 2 and irritancy rating of 1. Both of these numbers come from the 1989 study that used rabbit ears; a "2" means mildly comedogenic and a "1" means low irritancy.
Here's the catch: rabbit skin is more sensitive than human skin and throws a lot of false positives. A 1996 reappraisal found that ingredients rated 1-2 in the rabbit ear tests are generally safe for humans.
Remember comedogenic ratings are unable to assess the entire formula of a product or how it will react on your skin. Just be sure to patch test if you are unsure about certain ingredients.
This ingredient is not fungal acne safe. Cetearyl alcohol is a fatty alcohol with chain lengths that fall within the range that Malassezia can metabolize.
Learn more about Cetearyl AlcoholPetrolatum is more commonly known as petroleum jelly. It is created by mixing waxes and mineral oils.
This ingredient is effective at reducing water loss by 99%. This is because it is an occlusive. Occlusives create a hydrophobic barrier on the skin to prevent evaporation. This property makes it great for hydrating dry skin.
Pro tip: Use occlusives, such as this ingredient, on damp skin for the best results.
The quality or origin of petrolatum is only known when disclosed by the brand. Most cosmetic petrolatum has gone through several purification stages.
Another benefit of occlusives is it protects your skin against infection or allergies.
Petrolatum may not be safe for fungal-acne. Studies show mineral oil / petroleum leads to the growth of M. Furfur, a type of yeast.
However, it’s worth noting that petrolatum has a comedogenic rating of 0. In updated rabbit ear testing (and in human testing), petrolatum was found to be not comedogenic. This means it didn’t promote comedone formation in standard models.
Fungal acne isn’t about comedogenic ratings. It’s more about whether certain ingredients can feed the yeast on your skin, which can trigger those breakouts.
Learn more about PetrolatumWater. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!
Learn more about Water
