Cos De BAHA Azelaic Acid 10% Serum with Niacinamide Versus Paula's Choice BHA 9 Treatment
Updated on May 27, 2025
Overview
What they are
These products are both cruelty-free and reef safe . They have a total of 2 ingredients in common
Suited For
They're both likely to be good for fighting acne, dry skin, brightening skin, sensitive skin, oily skin, reducing pores and scar healing
Free From
They both do not contain any harsh alcohols, common allergens, fragrances, oils, parabens, silicones or sulfates
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Cos De BAHA Azelaic Acid 10% Serum with Niacinamide 13 ingredients
Paula's Choice BHA 9 Treatment 13 ingredients
What's inside (and what isn't)
What's inside (and what isn't)
At a glance
Click on any of the items below to learn more
Cos De BAHA Azelaic Acid 10% Serum with Niacinamide 13 ingredients
Paula's Choice BHA 9 Treatment 13 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.
As a surfactant, it helps collect dirt and oils for washing. Emulsifiers prevent oils and water from separating.
Polysorbate 20 also adds scent to a product. Since it is made using sorbitol, it has a sweet scent. Sorbitol can also be found in fruits such as apples and peaches.
The lauric acid used to create Polysorbate 20 is often derived from coconuts.
Polysorbate 20 may not be fungal acne safe.
Learn more about Polysorbate 20Propylene Glycol is an odorless, colorless liquid. As a humectant, it helps skin retain moisture. It also aids in delivering active ingredients.
Another role of this ingredient is preventing a product from melting or freezing. Propylene glycol also adds antimicrobrial properties to a product, elongating product lifespan.
This ingredient is considered an organic alcohol and commonly added into both cosmetics and foods.
Those with sensitive skin or conditions may develop a rash when using this ingredient.
Learn more about Propylene GlycolIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Cos De BAHA Azelaic Acid 10% Serum with Niacinamide 13 ingredients
Paula's Choice BHA 9 Treatment 13 ingredients
Reviews
Here's what our community thinks
