Two of the most popular liquid exfoliants in any Aussie skincare routine are the Paula's Choice 2% BHA Liquid and the COSRX BHA Blackhead Power Liquid. Both promise clearer pores, smoother texture and fewer blackheads, and both have built cult followings through years of word-of-mouth recommendations. After rotating between them across multiple tubes and a few harsh Sydney winters, I have thoughts worth sharing before you commit to either bottle.
Picking between them comes down to more than just price or packaging. Australian conditions, from the humidity of a Brisbane summer to the drying winter winds in Melbourne, change how these formulas behave on the skin. Add in different retailers, shipping times, and the way each formula layers with locally popular products like Australian-made serums, and the choice becomes a bit more layered than it looks on the shelf.
Both products are labelled as BHA exfoliants, but the active inside each bottle tells two different stories. The Paula's Choice formula uses 2% salicylic acid, which is the direct beta hydroxy acid that works on oily, congested skin by dissolving the bonds holding dead cells together inside the pore. Salicylic acid is oil-soluble, so it slips into the lining of the pore and clears out the mix of sebum and debris that forms blackheads and whiteheads.
The COSRX BHA Blackhead Power Liquid uses 4% betaine salicylate instead. Betaine salicylate is a gentler derivative that converts partially into salicylic acid once it lands on the skin, with willow bark water and niacinamide in the supporting cast. Many readers who find straight salicylic acid a touch sharp have found betaine salicylate to be a less reactive alternative, especially during a flare-up or when skin is reactive from the day before.
There is a useful breakdown of ingredient behaviour across Guess Journal if you enjoy reading about how formulas work on real complexions. Both products sit at skin-friendly pH levels, but the COSRX runs slightly closer to neutral while the Paula's Choice sits a bit lower, which matters if you are stacking actives.
The first thing you notice when you swipe either liquid onto clean skin is how thin both formulas are. Neither feels heavy, gritty or oily, and both absorb without leaving a chalky film behind. They behave very differently once they settle in, though.
The Paula's Choice 2% BHA Liquid feels almost watery on application, then disappears within seconds. There is no tackiness, no residue, and it leaves the skin feeling almost powdery once dry. This makes it an easy partner for everything that comes after, including silicone-heavy primers, SPF and richer night creams. If your evening routine ends with a facial oil or a heavier balm, you will not feel this exfoliant sitting underneath.
The COSRX BHA Blackhead Power Liquid has a slightly more viscous feel, closer to a thin essence than a watery toner. It leaves the faintest tackiness behind, which actually helps the next step grip better. If you are using a slippery hyaluronic acid serum on top, that little bit of grip is welcome. On a humid arvo in Sydney when everything slides off the face anyway, that tackiness is a small bonus.
Packaging matters more than people realise when you are using a product every other night for months. The Paula's Choice bottle is a tall opaque plastic with a flip-top cap that dispenses a controlled amount without drips. The plastic protects the formula from light, travels well in a gym bag, and the cap clicks shut with one hand, which is genuinely useful when your other hand is covered in cleanser.
The COSRX comes in a clear glass bottle with a dropper applicator. It looks lovely on a vanity and the dropper is precise, but glass is heavier in a wash bag and the dropper does require a bit of attention to keep hygienic between uses. The clear bottle also means the formula is exposed to light each time you open it, so I keep mine inside a drawer rather than on the bench.
Both formulas hold their stability well past opening, though the Paula's Choice tube keeps air out more effectively. If you are using a product once every two or three days rather than nightly, neither will oxidise quickly enough to matter, but the COSRX does darken slightly after six months of regular use, which is normal for willow bark formulations.
Across months of testing on my own combination, eczema-prone skin, both products delivered visible results on the nose and chin where blackheads are most stubborn. The Paula's Choice formula worked faster in the first two weeks. After fourteen nights of use, the sides of my nose felt smoother and the visible plugs on my chin had softened noticeably. By week four, texture across my forehead had refined enough that foundation sat flatter and stopped settling into small bumps.
The COSRX worked a touch slower but stayed steady. The first two weeks felt like nothing dramatic was happening, but by week three the pores on my cheeks looked less visible and a recurring cluster along the jawline settled down. The niacinamide in the formula appears to support barrier comfort while the exfoliant does its work, which is a thoughtful pairing for anyone whose skin reacts to stronger acids. If you are pairing acids with tools, my jade roller guide covers how to layer manual massage with actives without overworking the skin.
Neither product will completely erase pore size, since pore size is largely genetic. What both achieve, with consistent use, is cleaner pores that look smaller because the contents are no longer stretching them open. That distinction is worth keeping in mind when setting expectations.
Pricing between the two is meaningfully different once you convert and account for local retailers. The Paula's Choice 2% BHA Liquid retails for around $44 AUD for 118ml through the brand's Australian site and is stocked at Adore Beauty and Mecca. It also pops up during Priceline sales, though less often than Korean lines do.
The COSRX BHA Blackhead Power Liquid typically lands between $26 and $32 AUD for 100ml through Adore Beauty, eBay Australian sellers and the official COSRX Australia stockists that have grown in the last two years. If you shop through Yesstyle or international sellers, you can sometimes find it under $25 AUD, but you wait longer for shipping and there is no Australian returns process.
By the millilitre, the Paula's Choice works out slightly cheaper at full price, but the COSRX comes in well below during a Chemist Warehouse flash sale or a 20% Adore Beauty code. Both brands are cruelty-free, which matters to many Australian shoppers who now default to that filter when buying.
Rather than declaring a universal winner, the better approach is to match the formula to the skin sitting in front of you. Both products are excellent, and both have a permanent place in rotation depending on what the skin needs that month. Here are the situations where each one earns its spot.