COSRX The AHA 2 BHA 2 Blemish Treatment Versus Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant - US
Updated on June 17, 2025
Overview
What they are
These products are both vegan, cruelty-free, and reef safe . They have a total of 4 ingredients in common
Cool Features
They both contain BHA
Suited For
They're both likely to be good for fighting acne, dry skin, brightening skin, oily skin and reducing pores
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
COSRX The AHA 2 BHA 2 Blemish Treatment 17 ingredients
Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant 8 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
COSRX The AHA 2 BHA 2 Blemish Treatment 17 ingredients
Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant 8 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningPropanediol
Solvent
Polysorbate 20
Emulsifying
Glycolic Acid
Buffering
Salicylic Acid
Masking
Gluconolactone
Skin Conditioning
Zinc PCA
Humectant
Allantoin
Skin Conditioning
Sodium Hyaluronate
Humectant
Sodium Hydroxide
BufferingDipropylene Glycol
MaskingHydroxyacetophenone
Antioxidant
Caprylyl Glycol
EmollientEthylhexylglycerin
Skin ConditioningDipotassium Glycyrrhizate
Humectant
1,2-Hexanediol
Skin Conditioning
Disodium EDTA
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 20Salicylic Acid (also known as beta hydroxy acid or BHA) is a well-known ingredient for treating skin that struggles with acne and clogged pores. It exfoliates both the skin's surface and deep within the pores to help clear out buildup, control oil, and reduce inflammation.
Unlike AHAs (alpha hydroxy acids), salicylic acid is oil-soluble. This allows it to penetrate into pores which makes it especially effective for treating blackheads and preventing future breakouts.
Salicylic acid is also known for its soothing properties. It has a similar structure to aspirin and can calm inflamed or irritated skin, making it a good option for acne-prone skin that is also sensitive.
Concentrations of 0.5-2% are recognized by the U.S. FDA as an over-the-counter topical acne product.
It can cause irritation and/or dryness if one's skin already has a compromised moisture barrier, so it's best to focus on repairing that before introducing this ingredient into your routine.
While salicylic acid does not increase sun sensitivity, it’s still important to wear sunscreen daily to protect your skin.
If you are looking for the ingredient called BHA or Butylated Hydroxyanisole, click here.
Learn more about Salicylic AcidSodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.
In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.
Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.
"Alkaline" refers to a high pH level. A low pH level would be considered acidic.
Learn more about Sodium HydroxideWater. 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. Stay hydrated!
Learn more about WaterIngredient Ratings
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When to use
COSRX The AHA 2 BHA 2 Blemish Treatment 17 ingredients
Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant 8 ingredients
Reviews
Here's what our community thinks
