GS AHA BHA Facial Toner
GS AHA BHA Facial Toner
Product Description
Product overview
A concentrated exfoliating toner with 7% Glycolic Acid (AHA) and 0.5% Salicylic Acid (BHA) formulated at pH 3.5 to effectively remove dead skin cells, unclog pores, and brighten skin tone. Enhanced with Niacinamide and soothing botanical extracts for a smoother, clearer complexion without irritation.
Dual Acid Exfoliation
7% Glycolic Acid (AHA) dissolves surface dead skin cells while 0.5% Salicylic Acid (BHA) penetrates pores to clear oil and debris from within.
Texture & feel
SENSORYDual Acid Exfoliation
7% Glycolic Acid (AHA) dissolves surface dead skin cells while 0.5% Salicylic Acid (BHA) penetrates pores to clear oil and debris from within.
Brightening & Tone Correction
Niacinamide (Vitamin B3) works alongside AHA to reduce hyperpigmentation, even out skin tone, and support barrier repair.
Soothing Botanical Base
Aloe vera leaf extract base with green tea, elderflower, and edelweiss extracts to calm and protect skin during exfoliation.
Clean Formula
Free from 6 harmful ingredients: parabens, gluten, formaldehyde, fragrance, sulfates, and artificial colorants. Vegan and cruelty-free.
Safety & compatibility
SAFEContains 0.5% Salicylic Acid (BHA). While topical BHA at low concentrations is generally considered low risk, most dermatologists recommend avoiding salicylic acid during pregnancy. Consult your healthcare provider before use.
No ferments, fatty acids, fatty acid esters, polysorbates, or oils that feed malassezia. Safe for fungal acne-prone skin.
Oil-free, silicone-free formula with a comedogenic rating of 1/5. Very low risk of clogging pores.
AHA increases photosensitivity. Always apply SPF 30+ sunscreen during the day when using this toner. Best used in PM routine.
This is a concentrated acid toner (pH 3.5). Test a small amount on your neck before first use, especially if you have sensitive or reactive skin.
Free from alcohol, fragrance, essential oils, parabens, sulfates, and artificial dyes. Suitable for sensitive skin when introduced gradually.
Ingredient breakdown
INGREDIENTSGlycolic Acid 7%Proven
The smallest and most researched AHA molecule. At 7%, it effectively dissolves bonds between dead skin cells, promoting cell turnover for brighter, smoother skin. Also stimulates collagen production with long-term use.
- Mechanism: Breaks down desmosomes (bonds between dead cells) on the skin surface to accelerate natural exfoliation
- Effective range: Clinical studies show 5–20% concentrations are effective for exfoliation and anti-aging
- Collagen boost: Concentrations above 5% stimulate glycosaminoglycan and collagen synthesis over time
- Hydration: Increases natural hyaluronic acid production in the skin
Salicylic Acid 0.5%Proven
An oil-soluble BHA that penetrates into pores to dissolve excess sebum and clear congestion. Has anti-inflammatory and anti-bacterial properties, making it effective for acne and blackheads.
- Oil-soluble: Unlike AHAs, BHA can penetrate through sebum into pores for deep cleansing
- FDA recognized: 0.5–2% concentrations approved as over-the-counter acne treatment
- Anti-inflammatory: Structurally similar to aspirin, helping to calm redness and irritation
Niacinamide (Vitamin B3) ~3%Proven
A well-studied multi-tasking active that supports barrier repair, regulates oil production, reduces pore appearance, and fades hyperpigmentation. Stable and compatible with most other actives.
- Barrier repair: Increases ceramide production to strengthen the skin barrier
- Sebum regulation: Studies show 2–5% niacinamide reduces oil production and pore size
- Brightening: Inhibits melanosome transfer to reduce dark spots and uneven tone
- Anti-inflammatory: Helps reduce redness and calm irritated skin
Aloe Barbadensis Leaf Extract BaseProven
Used as the primary base instead of water, providing soothing, anti-inflammatory, and hydrating properties. Rich in polysaccharides that help calm skin during acid exfoliation.
- Soothing: Contains acemannan and other polysaccharides that reduce inflammation
- Hydration: Natural humectant properties help maintain skin moisture during exfoliation
Camellia Sinensis (Green Tea) Extract TraceProven
Potent antioxidant rich in EGCG catechins. Protects skin from free radical damage and environmental stress while providing anti-inflammatory benefits.
- Antioxidant: EGCG is one of the most potent antioxidants for skin protection
- UV protection: Studies show green tea polyphenols help protect against UV damage
12 ingredients
Aloe Barbadensis Leaf Extract, Glycolic Acid, Propanediol, Betaine Salicylate, 1,2-Hexanediol, Niacinamide, Salicylic Acid, Sodium Hydroxide, Camellia Sinensis Leaf Extract, Momordica Charantia Fruit Extract, Sambucus Nigra Flower Extract, Leontopodium Alpinum Extract
Where it fits in your routine
ROUTINEUse 2–3 times per week in your PM routine. On non-exfoliating days, use a hydrating toner instead. Always follow with sunscreen in the morning.
How to use
HOW TO USECleanse Your Face
Wash with a gentle cleanser and pat skin completely dry. Apply this toner to dry skin for best results and to minimize stinging.
Apply the Toner
Dispense an appropriate amount onto a cotton pad and gently swipe across face and neck, avoiding the eye area. Alternatively, pat directly onto skin with fingertips.
Wait & Absorb
Allow 1–2 minutes for the toner to fully absorb before proceeding. A slight tingling sensation is normal and should subside quickly.
Follow with Hydration
Apply a hydrating serum or essence, then lock in with a moisturizer. In the morning, always finish with SPF 30+ sunscreen.
Who is it for?
WHOPerfect for you if:
- You struggle with blackheads, whiteheads, or clogged pores
- You want to improve dull, uneven skin texture and tone
- You have oily or combination skin prone to breakouts
- You want an affordable K-beauty acid toner with proven actives
- You prefer a minimal, clean ingredient list (only 12 ingredients)
- You need a fungal acne-safe exfoliating toner
Consider alternatives if:
- You have very sensitive or rosacea-prone skin (try a PHA toner instead)
- You are pregnant or breastfeeding (contains salicylic acid)
- You are new to chemical exfoliants (start with a gentler formula first)
- You need intense hydration (this is an exfoliating toner, not a hydrating one)
- You already use retinol or other strong actives daily
Skin type compatibility
SKIN TYPESThe AHA+BHA combo controls excess sebum while clearing pores. Watery texture absorbs instantly without adding shine.
BHA targets oily T-zone pores while AHA smooths dry cheeks. Balances well across different face zones.
Non-comedogenic, fungal acne-safe, oil-free formula. BHA unclogs pores while AHA fades post-acne marks.
Great for maintaining smooth, radiant skin. Use 2–3 times weekly for gentle resurfacing and brightening.
The 7% glycolic acid at pH 3.5 may be too strong. Start once a week, use as a short-contact treatment, or consider a gentler alternative.
Can help with flaking and texture, but follow with a rich moisturizer. Limit to 1–2 times per week to avoid over-exfoliation.
Results timeline
MONTHS 2–3Immediate Smoothness
Skin feels noticeably smoother after first few uses. You may experience slight tingling as acids work on the surface layer. Some users report mild purging if acne-prone.
70% noticed smoother texturePore Clarity & Brightness
Blackheads start to diminish as BHA clears pore congestion. Skin appears brighter and more even-toned thanks to AHA exfoliation and niacinamide.
65% saw reduced blackheadsVisible Texture Improvement
Rough, bumpy texture visibly refined. Post-acne marks begin to fade. Pores appear smaller and less visible. Skin has a healthy glow.
80% reported improved skin textureLong-Term Clarity & Tone
Consistent use delivers significantly clearer, more radiant skin. Hyperpigmentation continues to fade. Glycolic acid begins to support collagen production for anti-aging benefits.
75% achieved clearer complexionRatings by platform
3K+ REVIEWSPros & cons
BALANCEDPraised
- Effective dual-acid exfoliation at proven concentrations (7% AHA + 0.5% BHA)
- Generous 200ml size offers excellent value for money
- Minimal, clean 12-ingredient formula with no fillers
- Fungal acne safe with no oils, ferments, or fatty acids
- Noticeable improvement in blackheads and skin texture within weeks
- Aloe vera base soothes skin during exfoliation
- Vegan, cruelty-free, and KFDA certified production
Criticized
- Can cause significant tingling or stinging, especially for acid beginners
- Not suitable during pregnancy due to salicylic acid content
- Leaves a slight tacky feeling; not ideal under makeup
- Too strong for very sensitive or rosacea-prone skin
- Basic packaging compared to other K-beauty brands
- May cause purging during the first 1–2 weeks of use
Budget-friendly alternatives (dupes)
DUPESSame 7% glycolic acid concentration in a larger 240ml bottle. Lacks BHA and niacinamide, so no pore-penetrating action. Contains aloe, ginseng, and amino acids. Not fungal acne safe due to Polysorbate 20.
Much gentler formula with only 0.1% glycolic acid plus betaine salicylate. Better for sensitive skin and daily use but far less effective for exfoliation. Spray bottle format. 150ml size.
Uses triple-acid approach (AHA + BHA + PHA) with tea tree and niacinamide. Lower individual acid concentrations. Can be more drying. 150ml bottle. Not fungal acne safe.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening
Store in a cool, dry place away from direct sunlight. Keep tightly sealed after each use. Refrigeration is not required but can enhance the soothing effect.
Plastic bottle with screw cap in paper box. Reinforced cosmetic-grade container (not glass).
No — 200ml exceeds the 100ml carry-on liquid limit. Decant into a smaller travel bottle for flights.
Frequently asked questions
FAQThis toner contains 0.5% Salicylic Acid (BHA), which most dermatologists recommend avoiding during pregnancy and breastfeeding. While the concentration is low and topical, the general medical consensus advises caution with any salicylic acid products. Glycolic acid is generally considered safe during pregnancy at this concentration, but consult your healthcare provider before using any chemical exfoliant while pregnant or nursing.
Yes, this toner is fungal acne safe. It contains no ferments, fatty acids, fatty acid esters, polysorbates, or oils that feed malassezia yeast. The minimal 12-ingredient formula avoids all common fungal acne triggers, making it one of the best exfoliating toner options for those dealing with fungal acne.
Avoid using this toner in the same routine as retinol, vitamin C serums, or other AHA/BHA products to prevent over-exfoliation and irritation. Instead, alternate them on different days or use this toner in your PM routine and vitamin C in your AM routine. Wait at least 30 minutes between acid products if you must layer them. Never combine with other exfoliating acids in the same session.
This toner is best suited for oily, combination, and acne-prone skin types. The dual AHA+BHA formula effectively targets excess sebum, clogged pores, and textural irregularities. Normal skin can also benefit from 2–3 times weekly use. Those with dry or sensitive skin should proceed with caution, starting once a week and gradually increasing frequency.
Most users notice smoother skin texture within the first week. Blackheads and pore congestion typically improve within 2–3 weeks of consistent use. Significant improvements in skin tone, dark spots, and overall clarity usually become visible after 4–6 weeks. For anti-aging benefits like collagen stimulation, expect results after 2–3 months of regular use.
Apply this toner as the first step after cleansing, on dry skin. It goes before essences, serums, moisturizers, and sunscreen. Use it 2–3 times per week in your PM routine. On non-exfoliating days, substitute with a hydrating toner. Always follow with sunscreen the next morning, as AHA increases sun sensitivity.
No, this toner has a comedogenic rating of 1/5 (very low). The formula is oil-free, silicone-free, and contains no known pore-clogging ingredients. In fact, the AHA and BHA actively work to unclog existing pore congestion. It is also fungal acne safe, making it one of the cleanest exfoliating toners available.
The toner has a Period After Opening (PAO) of 12 months. The generous 200ml bottle typically lasts 3–4 months when used 2–3 times per week. Store it in a cool, dry place away from direct sunlight and keep the cap tightly sealed to maintain the stability of the glycolic acid formula.
Verdict: The Cos De BAHA GS AHA BHA Facial Toner delivers serious exfoliating power at a budget-friendly price point. With 7% glycolic acid, 0.5% salicylic acid, and niacinamide in a clean 12-ingredient formula, it punches well above its weight class. The fungal acne-safe, oil-free formulation makes it a standout in the K-beauty acid toner category. It is best suited for oily, combination, and acne-prone skin types looking to tackle blackheads, texture, and dullness. Beginners to chemical exfoliants should start slowly, as the pH 3.5 formula is potent. Paired with consistent sunscreen use, this toner delivers visible results in as little as 1–2 weeks — making it one of the best value exfoliating toners available.
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 |
Aloe Barbadensis Leaf Extract
Emollient, Humectant, Skin Conditioning
|
Hydrating
Redness
Irritation
|
|
| 4 |
Glycolic Acid
Ph Adjuster, Buffering Agent, Exfoliant, Exfoliating, Buffering
|
Promotes Wound Healing
Dark Spots
Texture
Pores
|
|
| 1 |
Propanediol
Solvent, Viscosity Controlling, Viscosity Decreasing Agent
|
|
|
| 1 |
1,2-Hexanediol
Solvent, Skin Conditioning
|
Hydrating
|
|
| 1 |
Niacinamide
Skin Conditioning, Hair Conditioning, Smoothing
|
Promotes Wound Healing
Redness
Irritation
Dark Spots
Pores
|






