AC Collection Calming Liquid Mild
AC Collection Calming Liquid Mild
Product Description
Product overview
A gentle, alcohol-free toner-essence hybrid featuring 85.6% green tea water, mild BHA and PHA exfoliants, and COSRX's proprietary CentellAC-RX complex to calm acne-prone skin, reduce redness, and maintain oil-moisture balance without irritation.
85.6% Green Tea Water
Antioxidant-rich base that soothes inflammation, provides antibacterial benefits, and helps heal blemishes.
Texture & feel
SENSORY85.6% Green Tea Water
Antioxidant-rich base that soothes inflammation, provides antibacterial benefits, and helps heal blemishes.
Gentle BHA + PHA Exfoliation
0.2% Betaine Salicylate and 0.2% Gluconolactone provide mild exfoliation without irritation.
CentellAC-RX Complex
Proprietary blend of Asiaticoside, Asiatic Acid, and Madecassic Acid for accelerated skin healing.
Sulfur-Based Sebum Control
Dimethyl Sulfone helps regulate excess oil production and prevents acne-causing factors.
Safety & compatibility
SAFEContains 0.2% Betaine Salicylate (BHA). COSRX advises avoiding BHA products during pregnancy. Consult your doctor before use.
Contains Polyglyceryl-10 Laurate and Polyglyceryl-10 Myristate which may feed malassezia yeast.
Hypoallergenic formula with EWG Green Grade ingredients. Suitable for teenagers and reactive skin types.
Low comedogenic rating (1/5). Unlikely to clog pores or cause breakouts for most skin types.
Safe to use with most actives. Apply acids first, wait 20-30 minutes before retinol. Alternate days if sensitivity occurs.
BHA and PHA increase photosensitivity. Always apply SPF 30+ during daytime use.
Ingredient breakdown
INGREDIENTSGreen Tea Water (Camellia Sinensis Leaf Water) 85.6%Proven
Forms the base of this formula, providing potent antioxidant and anti-inflammatory benefits. Green tea catechins help neutralize free radicals and calm irritated skin.
- Antioxidant: EGCG catechins protect against environmental damage and premature aging
- Antibacterial: Helps fight acne-causing bacteria (P. acnes)
- Soothing: Reduces inflammation and redness in reactive skin
Betaine Salicylate (BHA) 0.2%Proven
A gentler derivative of salicylic acid commonly used in K-Beauty due to Korean cosmetic regulations. Combines betaine (moisturizing) with salicylic acid (exfoliating) for effective yet mild pore-clearing action.
- Oil-soluble: Penetrates pores to dissolve sebum and dead skin cells
- Anti-inflammatory: Reduces redness and swelling from breakouts
- Gentler: Less irritating than pure salicylic acid at equivalent efficacy
Gluconolactone (PHA) 0.2%Proven
A polyhydroxy acid (next-generation AHA) that provides gentle exfoliation with added hydrating benefits. Larger molecular size means less irritation compared to traditional AHAs.
- Gentle exfoliation: Removes dead skin cells without disrupting barrier
- Humectant: Attracts moisture to the skin while exfoliating
- Antioxidant: Helps protect skin from oxidative stress
CentellAC-RX Complex UndisclosedProven
COSRX's proprietary blend of three centella asiatica-derived compounds: Asiaticoside, Asiatic Acid, and Madecassic Acid. Known for exceptional wound healing and skin barrier repair.
- Asiaticoside: Stimulates collagen synthesis and promotes wound healing
- Asiatic Acid: Anti-inflammatory and helps with scar reduction
- Madecassic Acid: Strengthens skin barrier and calms irritation
Tea Tree Oil (Melaleuca Alternifolia) TracePromising
Natural essential oil with antimicrobial and anti-inflammatory properties. Provides the product's light herbal scent while offering acne-fighting benefits.
- Antimicrobial: Helps kill acne-causing bacteria on skin surface
- Anti-inflammatory: Reduces swelling and redness of pimples
18 ingredients
Camellia Sinensis Leaf Water, Butylene Glycol, Dimethyl Sulfone, Betaine, 1,2-Hexanediol, Betaine Salicylate, Gluconolactone, Polyglyceryl-10 Laurate, Polyglyceryl-10 Myristate, Glycerin, Panthenol, Allantoin, Arginine, Sodium Hyaluronate, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Asiaticoside, Asiatic Acid, Madecassic Acid
Where it fits in your routine
ROUTINEUse after cleansing, before thicker products. Can be used morning and night. Always follow with SPF during the day.
How to use
HOW TO USECleanse Your Face
Start with clean, freshly washed skin. Pat dry gently, leaving skin slightly damp.
Apply with Cotton Pad
Soak a cotton pad with the liquid and gently sweep over face, avoiding the eye area. This method helps with gentle exfoliation.
Pat to Absorb
Gently pat any remaining product into the skin until fully absorbed. No need to rinse.
Continue Routine
Follow with your essence, serum, and moisturizer. In the morning, always finish with sunscreen SPF 30+.
Who is it for?
WHOPerfect for you if:
- You have mild to moderate acne or occasional breakouts
- Your skin is sensitive and can't tolerate harsh acids
- You want gentle daily exfoliation without dryness
- You struggle with redness and inflammation
- You're new to chemical exfoliants (BHA/PHA)
- You're a teenager dealing with hormonal acne
- You want an alcohol-free acne treatment
Consider alternatives if:
- You have severe, cystic acne requiring stronger treatment
- You have confirmed fungal acne (malassezia folliculitis)
- You're pregnant or breastfeeding (consult doctor first)
- You're sensitive to tea tree oil
- You need intensive pore-clearing (try the Intensive version)
- You want visible exfoliation results quickly
Skin type compatibility
SKIN TYPESLightweight formula helps control sebum without stripping. Green tea and BHA work together to reduce oiliness.
Balances oily T-zone while gentle enough for drier cheeks. Helps maintain overall oil-moisture equilibrium.
Specifically formulated for acne. Non-comedogenic, antibacterial, and helps prevent future breakouts.
Hypoallergenic and alcohol-free. Patch test recommended if reactive to tea tree oil.
May need additional hydration. Layer with hydrating toner or use a rich moisturizer after.
Results timeline
WEEKS 8+Immediate Soothing & Reduced Redness
Skin feels calmer and less irritated immediately after application. Cooling sensation helps with inflamed breakouts.
85% noticed soothing effectBreakouts Start to Heal Faster
Active pimples begin to flatten and heal more quickly. New breakouts appear smaller and less inflamed than before.
70% noticed faster healingSmoother Texture & Fewer Breakouts
Noticeable improvement in skin texture. Frequency of new breakouts decreases with consistent use.
65% noticed clearer skinLong-term Clarity & Balance
Skin maintains better oil-moisture balance. Pores appear cleaner and overall complexion looks healthier.
60% saw significant improvementRatings by platform
4K+ REVIEWSPros & cons
BALANCEDPraised
- Gentle enough for daily use on sensitive skin
- Effectively soothes redness and inflammation
- Alcohol-free formula maintains moisture barrier
- Short, clean ingredient list with EWG Green ratings
- Helps heal existing breakouts faster
- Lightweight, non-sticky texture absorbs quickly
- Good value for the quality and amount
- Suitable for teenagers and beginners to acids
Criticized
- Too mild for severe or cystic acne
- Not fungal acne (malassezia) safe
- Tea tree scent may bother some users
- Results take several weeks to appear
- Limited oil control compared to stronger BHAs
- Not suitable during pregnancy without doctor approval
- Screw cap bottle less convenient than pump
Budget-friendly alternatives (dupes)
DUPESContains 0.9% Betaine Salicylate (stronger than COSRX Mild), willow bark, and centella. 200ml bottle offers better value per ml. Fragrance-free option.
Triple acid formula (AHA, BHA, PHA) with tea tree. Stronger exfoliation, contains niacinamide for brightening. May be too strong for very sensitive skin.
Same line, stronger formula with 0.9% BHA and 1.5% AHA. Contains propolis and alcohol. Better for moderate to severe acne but may irritate sensitive skin.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening
Store in a cool, dry place away from direct sunlight. Keep cap tightly closed.
Frosted plastic bottle with screw-top cap. Semi-transparent to monitor product level.
Yes, 125ml is over the 100ml liquid limit. Decant into smaller container for flights.
Frequently asked questions
FAQThis product contains 0.2% Betaine Salicylate (BHA). While the concentration is low, COSRX officially advises avoiding products containing AHA, BHA, and fragrances during pregnancy and breastfeeding. Always consult your healthcare provider before using any exfoliating products during this time.
No, this product is NOT fungal acne safe. It contains Polyglyceryl-10 Laurate and Polyglyceryl-10 Myristate, which are esters that can potentially feed malassezia yeast. If you have confirmed fungal acne, look for products specifically formulated to be FA-safe.
Yes, but with caution. Since this product contains mild BHA and PHA, avoid layering with other strong acids in the same routine to prevent over-exfoliation. For retinol, apply acids first, wait 20-30 minutes, then apply retinol. Vitamin C can be used in the morning while this toner is used at night. If irritation occurs, alternate days.
This product is best suited for oily, combination, and acne-prone skin types. It's particularly excellent for sensitive skin that can't tolerate stronger acids. It's also ideal for teenagers and those new to chemical exfoliation. Dry skin types may need additional hydration after use.
Most users notice immediate soothing effects within the first week. Breakouts typically start healing faster within 2-3 weeks. Significant improvement in overall skin clarity and fewer breakouts is usually seen after 4-8 weeks of consistent daily use. This is a gentle formula, so patience is key.
Apply this product immediately after cleansing, as the second step in your routine. Use it before essences, serums, and moisturizers. It can be used both morning and night. If using in the morning, always follow with sunscreen SPF 30+ as the BHA and PHA increase sun sensitivity.
No, this product has a low comedogenic rating of 1/5 and is labeled as non-comedogenic. The lightweight, watery formula is designed to be absorbed quickly without leaving residue that could clog pores. The BHA actually helps keep pores clear by dissolving sebum buildup.
The product has a PAO (Period After Opening) of 12 months. With daily use (morning and night), the 125ml bottle typically lasts 2-3 months. Store in a cool, dry place away from direct sunlight and keep the cap tightly closed to maintain efficacy.
Verdict: The COSRX AC Collection Calming Liquid Mild is an excellent entry-level exfoliating toner for those with sensitive, acne-prone skin who want gentle daily treatment without irritation. The 85.6% green tea water base combined with low-dose BHA and PHA provides effective yet mild exfoliation, while the CentellAC-RX complex accelerates healing. However, it's not suitable for fungal acne sufferers or those seeking aggressive acne treatment. For severe acne, consider the Intensive version or stronger alternatives. Perfect for maintaining already-clear skin or managing mild breakouts with minimal risk of irritation.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 0 |
Camellia Sinensis Leaf Water
Masking, Perfuming, Tonic
|
|
|
| 1 |
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
|
Hydrating
|
|
| 1 |
Dimethyl Sulfone
Solvent, Viscosity Controlling, Viscosity Decreasing Agent
|
|
|
| 1 |
Betaine
Skin Conditioning, Humectant, Viscosity Controlling, Antistatic Agent, Hair Conditioning
|
Hydrating
Irritation
Dark Spots
|
|
| 1 |
1,2-Hexanediol
Solvent, Skin Conditioning
|
Hydrating
|






