If you’ve ever struggled with clogged pores, dull skin, or stubborn little bumps, you’ve probably heard of BHA exfoliants. Two of the most popular, top-rated BHA exfoliants are Paula’s Choice 2% BHA Liquid Exfoliant and COSRX BHA Blackhead Power Liquid.
Both promise smoother, clearer, and brighter skin — but which one works best for your skin type? That depends on your skin, tolerance, and the results you want to see.
Think of this as your friendly skincare guide.
By the end, you’ll know how each BHA works, what makes them different, and which will fit into your routine — without irritation or overspending.
Before we dive in, it’s helpful to understand what BHA exfoliation really means and why dermatologists often call salicylic acid a game-changer for acne-prone and textured skin.
🧴 Related Read: AHA & BHA Exfoliation Guide — a quick breakdown of how chemical exfoliants work and which one your skin needs.
Featured in this article (Also available at your local Store) :
What Are BHAs and How Do They Work?
Let’s start with the basics — BHA stands for Beta Hydroxy Acid, and the most common one you’ll see in skincare is salicylic acid.
- Unlike AHAs (which work on the skin’s surface), BHAs go deep into pores, dissolving excess oil and dead skin cells.
- This makes them a must-have for oily or acne-prone skin.
Dermatologist Dr. Joshua Zeichner explains,
“Salicylic acid is oil-soluble, which means it can penetrate into the pores and remove buildup from inside. This makes it ideal for treating acne and improving texture.”
In other words, if you’ve ever struggled with tiny bumps under your skin or dullness that just won’t go away, a BHA exfoliant helps to clear that up without the harsh scrubbing that can irritate sensitive skin.
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If you’re new to chemical exfoliants, you can also check out our Gentle Exfoliation: Why Mandelic Acid Is Ideal for Sensitive Skin — it’s a great option for those who want to start slow before trying stronger acids like BHA.
Paula’s Choice 2% BHA Liquid Exfoliant
This cult-favorite, popular BHA exfoliant is often called the gold standard in skincare communities. It’s gentle enough for daily use but strong enough to clear blackheads and smooth skin texture.
This formula contains 2% salicylic acid, a beta hydroxy acid that dives deep into your pores to unclog oil, remove dead cells, and reduce blackheads. It also includes Green Tea Extract, which helps calm redness and protect your skin barrier.
Key Ingredients:
- 2% Salicylic Acid – unclogs pores and removes dead skin cells
- Green Tea Extract – soothes redness and protects the skin
- Methylpropanediol – enhances absorption
According to board-certified dermatologist Dr. Whitney Bowe,
“Paula’s Choice 2% BHA is one of the most balanced salicylic acid exfoliants out there. It’s effective enough to treat congestion but gentle enough for daily use, even on sensitive skin.”
That’s what makes it such a versatile pick. It works for dry, oily, combination, and normal skin types alike.
pH Level: 3.2–3.8
Texture: Lightweight, watery
Frequency:
- Beginners / Sensitive Skin: Start 2–3 times per week to allow your skin to adjust.
- Normal / Combination / Oily Skin: Can be used daily, either in the morning or at night after cleansing and before moisturizer.
Usage: Apply after cleansing and before moisturizer. No rinse needed.
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COSRX BHA Blackhead Power Liquid
If Paula’s Choice is known for its all-round gentleness, COSRX BHA Blackhead Power Liquid is one of the most popular Korean BHA exfoliants, loved for its gentle yet effective pore-clearing action.
It uses gentle Betaine Salicylate (4%), which is milder than salicylic acid but still clears pores and smooths texture.
Key Ingredients & Benefits:
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4% Betaine Salicylate – a gentle BHA that exfoliates inside the pores, helping reduce blackheads and prevent breakouts.
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Willow Bark Water – naturally derived salicylic acid that soothes the skin while providing gentle exfoliation.
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Niacinamide – brightens the skin and improves uneven texture.
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Sodium Hyaluronate – hydrates, locks in moisture, and keeps the skin soft and plump.
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Panthenol (Vitamin B5) – helps calm irritation and supports skin barrier health.
pH Level: 4.0–5.0
Texture: Lightweight, slightly slippery liquid that absorbs quickly
Frequency: 2–3 times per week (depending on skin tolerance)
Usage Tip: Apply after cleansing and before moisturizer. Can be used with other gentle actives, but avoid layering with strong acids or retinol on the same day.
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Before We Compare…
Now that you know what makes Paula’s Choice 2% BHA Liquid Exfoliant a cult-favorite, popular BHA, and why COSRX BHA Blackhead Power Liquid is a widely loved Korean exfoliant, it’s time to see how they stack up side by side.
While both use BHAs to clear pores and smooth skin, they are designed for different needs and routines:
- Paula’s Choice is gentle, daily-use, and works for all skin types, including sensitive skin.
- COSRX is beginner-friendly, slightly milder, and ideal for oily or combination skin struggling with blackheads.
If you’ve ever wondered which one truly fits your skincare goals — whether you want long-term smoothness, gentle pore clearing, or a beginner-friendly exfoliant — this head-to-head BHA exfoliant comparison will help you decide.
Head-to-Head Comparison: Paula’s Choice vs The COSRX BHA
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💬 Dermatologist Insight:
According to Dr. Whitney Bowe, board-certified dermatologist and skincare researcher, “BHA exfoliants like salicylic acid are best used as leave-on treatments for consistent, long-term results. Peels with higher acid concentrations, like The Ordinary’s, can deliver fast improvements but must be handled carefully to avoid barrier damage.”
So… Which One Should You Choose?
It really comes down to your skin type, tolerance, and goals. Both Paula’s Choice and The COSRX are excellent BHA exfoliants — but they’re designed for different skincare personalities. Let’s break it down 👇
👉 Choose Paula’s Choice 2% BHA Liquid Exfoliant if:
Best for: All skin types, sensitive skin, blackheads, and uneven texture.
- You’re new to chemical exfoliants.
- Your skin is sensitive, combination, or easily irritated.
- You want something gentle enough for daily use.
- You prefer a lightweight, no-rinse formula that fits easily into your routine.
Without the sting, this formula delivers slow and steady results — smoother texture, fewer blackheads, and balanced oil production. It’s like a daily skin polish that keeps your complexion clear and calm.
👉 Choose COSRX BHA Blackhead Power Liquid if:
You want a gentle but effective BHA for beginners or those with slightly sensitive skin.
- You’re focused on reducing blackheads, clogged pores, and rough texture.
- You prefer a mild, lightweight liquid that can be used 2–3 times per week.
- You want a budget-friendly, popular Korean skincare favorite
This formula works like a gentle deep clean for your pores, helping improve skin texture gradually without irritation. It’s perfect for those who want effective results without daily strong acids.
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How to Choose the Right BHA Exfoliant for Your Skin
Picking the right BHA isn’t just about brand names — it’s about your skin type, goals, and how your skin reacts. Here’s a simple guide to help you make the best choice:
1️⃣ Know Your Skin Type
- Oily / Acne-Prone: BHAs work wonders to unclog pores, reduce blackheads, and control oil. Both Paula’s Choice and COSRX are great, but COSRX is slightly gentler for beginners.
- Combination: Choose products that balance oily and dry areas — like Paula’s Choice 2% BHA Liquid.
- Sensitive / Dry: Stick to gentle, lower-strength BHAs, such as COSRX, and avoid daily strong exfoliants at first.
2️⃣ Start Slow
Even if your skin seems tough, don’t overdo it. Begin 2–3 times per week and gradually increase frequency if your skin tolerates it well.
3️⃣ Check the Concentration
- Most BHAs are effective at 1–2% salicylic acid.
- Paula’s Choice (2% SA) is ideal for daily use and long-term results.
- COSRX (4% Betaine Salicylate) is gentler and beginner-friendly, suitable for gradual improvement.
4️⃣ Consider Texture and Formula
- Watery/liquid: Lightweight, absorbs quickly — ideal for layering under other skincare (Paula’s Choice, COSRX).
- Leave-on vs peel: Both are leave-on liquids, but Paula’s Choice can be used daily, while COSRX is recommended 2–3 times per week for gentle exfoliation.
5️⃣ Set Your Goals
Ask yourself:
- Are you targeting blackheads or breakouts?
- Do you want smoother, brighter skin?
- Are you prepping your skin for other treatments?
Once you know your goals, it’s easier to pick the BHA that fits your routine — whether it’s the popular Paula’s Choice for daily results or COSRX for gentle, gradual improvement.
6️⃣ Read Reviews and Learn from Others
Feedback from people with your skin type can reveal how effective a product is and whether it may cause irritation. Both Paula’s Choice and COSRX have strong followings and rave reviews from skincare enthusiasts.
Tips for Using BHA Exfoliants Safely
Using a BHA exfoliant correctly is just as important as picking the right one. Follow these tips to get the best results from Paula’s Choice BHA or COSRX BHA without irritating your skin:
1️⃣ Start Slowly
Even if your skin feels fine, don’t overdo it.
- COSRX: Use 2–3 times per week at first.
- Paula’s Choice: Beginners can start 2–3 times per week and gradually increase to daily use if tolerated.
2️⃣ Avoid Layering with Strong Acids
Using multiple strong acids or retinol on the same day can irritate skin. Try this simple schedule:
- Night: BHA exfoliant (Paula’s Choice or COSRX)
- Morning: Vitamin C or gentle moisturizer + sunscreen
3️⃣ Always Use Sunscreen
BHA exfoliants make skin more sensitive to sunlight. A broad-spectrum SPF every morning is essential to protect your skin and prevent premature aging.
4️⃣ Don’t Over-Exfoliate
Too much exfoliation can damage your skin barrier, causing redness, dryness, or breakouts. Stick to the recommended frequency:
- COSRX: 2–3 times weekly
- Paula’s Choice: Daily or every other day depending on tolerance
5️⃣ Patch Test First
Before applying all over your face, test a small patch on your jawline or inner arm. If irritation occurs, wait a few days before trying again, or switch to a gentler formula.
6️⃣ Layer Smartly
After your BHA, follow with a hydrating serum or moisturizer. This locks in moisture and keeps your skin soft, smooth, and healthy.
💡 Extra Tip:
If you’re new to chemical exfoliation, start with COSRX to see how your skin reacts. Once your skin builds tolerance, you can add Paula’s Choice for daily, long-term exfoliation.
Frequently Asked Questions on BHA Exfoliants
What is the difference between Paula’s Choice and COSRX BHA?
- Paula’s Choice 2% BHA Liquid Exfoliant: Daily-use, suitable for all skin types, including sensitive skin. Gentle yet effective for long-term pore clearing.
- COSRX BHA Blackhead Power Liquid: Milder, used 2–3 times per week, perfect for beginners or those with oily/combination skin.
Can BHA exfoliants be used daily?
- Paula’s Choice: Yes, if your skin tolerates it. Start slow 2–3 times per week, then increase gradually.
- COSRX: Recommended 2–3 times per week; daily use may irritate sensitive skin.
Which BHA is best for sensitive skin?
- Paula’s Choice is generally considered gentle enough for sensitive skin. Patch test first.
- COSRX is mild but should be used sparingly if skin is very sensitive.
How long does it take to see results?
- Most users notice smoother skin in 2–4 weeks.
- Reduction in blackheads and improved texture may take 6–8 weeks of consistent use.
Can I use BHA exfoliants with retinol or vitamin C?
Avoid using BHA on the same day as strong acids or retinol. Instead:
- Night: BHA exfoliant
- Morning: Vitamin C + sunscreen
Can BHA exfoliants help with blackheads?
Yes! Both Paula’s Choice and COSRX penetrate pores to dissolve excess oil and dead skin cells, making them effective at reducing blackheads and preventing new ones.
Can BHA improve skin texture and dullness?
Absolutely. Regular use of BHA exfoliants smooths rough patches, evens out texture, and brightens the skin over time. Paula’s Choice is great for daily maintenance, while COSRX offers a gentle improvement for beginners.
Is it safe to use BHA during the day?
Yes, but always apply sunscreen afterward, as BHAs make your skin more sensitive to UV damage.
Can I use BHA with other skincare products?
- Layer hydrating serums or moisturizers after your BHA to lock in moisture.
- Avoid strong acids, retinol, or exfoliating scrubs on the same day to prevent irritation.
Can BHA exfoliants cause purging?
- Some users may experience temporary breakouts during the first 1–2 weeks — this is known as purging and usually subsides as the skin adjusts.
- COSRX’s milder formula may reduce the likelihood of purging compared to stronger daily-use BHAs like Paula’s Choice.
How do I know which BHA is right for me?
- Beginner or sensitive skin: Start with COSRX BHA Blackhead Power Liquid 2–3 times per week.
- Daily maintenance or all skin types: Go for Paula’s Choice 2% BHA Liquid Exfoliant.
- Track results over 4–6 weeks and adjust frequency based on how your skin reacts.
Final Thought
Both Paula’s Choice 2% BHA Liquid Exfoliant and COSRX BHA Blackhead Power Liquid are popular, effective options, but they serve slightly different needs:
- Paula’s Choice 2% BHA Liquid Exfoliant: Ideal for sensitive, combination, or normal skin. Gentle enough for daily use, it unclogs pores, smooths texture, and reduces blackheads over time. Think of it as a daily skin polish that keeps your complexion clear and balanced.
- COSRX BHA Blackhead Power Liquid: Best for oily, combination, or blackhead-prone skin. Gentle yet effective, it’s perfect for beginners and used 2–3 times per week. It gradually improves skin texture, reduces blackheads, and is a budget-friendly, popular Korean skincare favorite.
The key is to listen to your skin, start slowly, and always protect yourself with sunscreen. Over time, consistent use of the right BHA exfoliant will leave your skin looking clearer, smoother, and healthier.
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Disclaimer
This article is for informational purposes only and does not replace professional medical advice. Always consult a dermatologist or healthcare provider before introducing new exfoliants—especially if you have sensitive skin, underlying conditions, or allergies. Product effectiveness may vary depending on your individual skin type and usage.
References
Paula’s Choice. How does a BHA exfoliant work? Retrieved from Paula’s Choice EU website
The Ordinary / DECIEM. Official Site. Retrieved from The Ordinary website.
BHA and BHT. (2009, October 31). Archived. Retrieved November 20, 2009, from [National Library of Medicine archives].
SciFinder. (2009). Experimental properties for 121-00-6. Retrieved November 20, 2009.
National Library of Medicine. (n.d.). Hazardous Substances Database.
Scientific American. (2013, December 19). BHA and BHT: A case for fresh? Retrieved December 27, 2022, from https://www.scientificamerican.com
Lam, L. K., Pai, R. P., & Wattenberg, L. W. (1979). Synthesis and chemical carcinogen inhibitory activity of 2-tert-butyl-4-hydroxyanisole. Journal of Medicinal Chemistry, 22(5), 569–571. https://doi.org/10.1021/jm00191a020
National Institutes of Health. (2005). Butylated Hydroxyanisole (BHA), CAS No. 25013-16-5: Report on Carcinogens (11th ed.). Research Triangle Park, NC: U.S. Department of Health and Human Services.
Botterweck, A. A. M., Verhagen, H., Goldbohm, R. A., Kleinjans, J., & Van den Brandt, P. A. (2000). Intake of butylated hydroxyanisole and butylated hydroxytoluene and stomach cancer risk: Results from analyses in the Netherlands Cohort Study. Food and Chemical Toxicology, 38(7), 599–605. https://doi.org/10.1016/S0278-6915(00)00042-9