What does the serum feel like and how does it finish?

It has a watery, hydrating and soft texture that absorbs quickly, leaving a light, smooth and refreshing finish.

Where does this serum go in a skincare routine?

Apply it after toner, during the essence or serum step. Pat lightly until absorbed and leave it on.

Should it be used in the morning or at night?

Nighttime use is recommended. If you apply it during the day, follow with sunscreen.

How often should a new user apply it?

Test it before use, then begin two to three times weekly according to your skin's condition. Nightly use is an option after testing if no irritation occurs.

Is the texture suitable for combination or oily skin?

Yes. The light, quickly absorbed texture is specifically described as suitable for combination-to-oily skin.

Which ingredients provide the AHA and BHA components?

The formula identifies glycolic acid as its AHA and betaine salicylate as its BHA.

Free US Express shipping from $79

COSRX

Refresh AHA BHA Vitamin C Booster Serum

What it is: A watery AHA, BHA and niacinamide booster serum that gently exfoliates dead skin cell buildup and supports a brighter, more even-looking tone.

Gentle surface exfoliation
Brighter, more even-looking tone
Watery, fast-absorbing texture
Suited to combination-to-oily skin

Net weight: 30 ml / 1.01 fl. oz.

Refresh AHA BHA Vitamin C Booster Serum

30ml ·$19.99 USD

Gentle surface exfoliation

Brighter, more even-looking tone

Watery, fast-absorbing texture

Suited to combination-to-oily skin

Main active: Glycolic Acid and Betaine Salicylate
Intensity: Gentle

PRODUCT DETAILS

Hello, fresh start. This leave-on booster serum gently exfoliates to help rough, dull-looking skin appear smoother and brighter. It offers a simple way to care for dead skin cell buildup while supporting a more even-looking tone.

The formula brings together AHA and BHA, identified as glycolic acid and betaine salicylate, with 2% niacinamide. This combination shapes the serum's exfoliating and brightening focus without turning your routine into homework.

Its watery, hydrating texture absorbs quickly with a light finish. The soft consistency settles into a smooth, refreshing feel rather than leaving a heavy layer behind.

That light touch makes it well suited to combination-to-oily skin, especially when excess oil, rough texture and dullness are your main concerns. It is designed as a leave-on serum and can be introduced gradually, giving you room to find a rhythm that feels right for your skin.

Learn more

GOES WELL WITH

2-Step Greenery Calming Ampule Mask$15.99 USD

1% Oligo Hyaluronic Acid Toner$15.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Lotion$14.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Cream$24.99 USD

Gentle exfoliation meets a watery, light finish for skin that looks smoother, brighter and more even.

Gentle surface exfoliation
Brighter-looking tone
Light hydration

Key Ingredients

Glossy blush-lilac loop and translucent peach folded form arranged on a softly textured coral surface with a gentle shadow.

Glycolic Acid and Betaine Salicylate

An AHA/BHA pair that helps exfoliate dead surface skin for a smoother, fresher-looking complexion.

Niacinamide

Helps visibly brighten uneven tone and support the skin barrier.

Seven dry amber, apricot, lavender and celadon relief rays spread diagonally across one warm-ivory matte plaster surface beside a tiny coral point.

Vitamin C

An antioxidant ingredient family that can help brighten uneven-looking tone and soften visible dullness.

A soft peach-orange translucent folded sculptural form dotted with clear droplets on a seamless warm peach surface, casting a gentle shadow.

Hippophae Rhamnoides Water

A sea buckthorn botanical water used in brightening-focused formulas to support a more radiant, even-looking complexion.

Panthenol

Pro-vitamin B5 that helps skin hold moisture and feel softer and more comfortable.

Clear hydrogel spheres and droplets on a pale lilac background.

Hyaluronic Acid

Helps hydrate and visibly plump the skin.

Three oversized translucent, softly faceted glass crystals arranged on a pale lavender stage above a blush background with a small coral accent.

Allantoin

Helps soothe and soften dry, rough-feeling skin.

Benefits infographic listing the featured skin concerns and product positioning.

Concerns & Benefits

Your Concerns

1
Uneven Texture
For rough-looking skin affected by surface buildup and dead skin cells.
2
Dullness
For skin that looks dull or uneven and could use a brighter-looking finish.
3

How To Use

1Test the serum before first use, particularly if your skin is sensitive.
2At night, apply it evenly after toner during the essence or serum step.
3Pat lightly until absorbed, then leave the serum on your skin.
4Begin with two to three applications weekly according to your skin's condition. After testing, nightly use is an option if no irritation occurs.
5If you use the serum during the day, follow with sunscreen.

Application infographic showing the order, absorption step and daytime SPF reminder.

Frequently asked questions

What does this booster serum help with?

It gently exfoliates dead skin cell buildup and helps rough, dull-looking skin appear smoother, brighter and more even.

Keep learning

Customer reviews

Frequently Bought Together

Buy these products together

This itemRefresh AHA BHA Vitamin C Booster Serum$19.99 USD

2-Step Greenery Calming Ampule Mask$15.99 USD

1% Oligo Hyaluronic Acid Toner$15.99 USD

Total price: $51.97 USD

This itemRefresh AHA BHA Vitamin C Booster Serum$19.99 USD

2-Step Greenery Calming Ampule Mask$15.99 USD

1% Oligo Hyaluronic Acid Toner$15.99 USD

Total price: $51.97 USD

CNP Laboratory

2-Step Greenery Calming Ampule Mask

Ampule-first sheet mask care for gentle hydration and a fresh, refined-looking finish.

5 treatments$15.99 USD

Onething

1% Oligo Hyaluronic Acid Toner

Lightweight hydration with 1% hydrolyzed sodium hyaluronate.

150 ml$15.99 USD

VT COSMETICS

100 Reedle Shot Stick Pouch

A travel-size evening booster for smoother-feeling, more refined-looking skin.

2 mL × 10$8.09 USD

ROUND LAB

1025 Dokdo Cleanser

Creamy, slightly acidic foam for a comfortable cleanse

150 ml$11.99 USD

ROUND LAB

1025 Dokdo Eye Cream

Lightweight daily eye care for hydration, brightness and smoother-looking fine lines.

30 ml / 1.01 fl oz$22.99 USD

ROUND LAB

1025 Dokdo Lotion

A lightweight, unscented facial moisturizer with three forms of hyaluronic acid for lasting moisture without stickiness.

200 ml$14.99 USD

ROUND LAB

1025 Dokdo Sleeping Pack

A lightweight, unscented overnight gel for hydration and smoother-feeling skin.

100 ml$15.99 USD

ROUND LAB

1025 Dokdo Cream

A rich, unscented balm moisturizer for lasting hydration and a soft, cushioned feel.

80 ml$24.99 USD

COSRX Refresh AHA BHA Vitamin C Booster Serum 30ml

COSRX

Refresh AHA BHA Vitamin C Booster Serum

What it is: A watery AHA, BHA and niacinamide booster serum that gently exfoliates dead skin cell buildup and supports a brighter, more even-looking tone.

Gentle surface exfoliation
Brighter, more even-looking tone
Watery, fast-absorbing texture
Suited to combination-to-oily skin

Net weight: 30 ml / 1.01 fl. oz.

Refresh AHA BHA Vitamin C Booster Serum

30ml ·$19.99 USD

Gentle surface exfoliation

Brighter, more even-looking tone

Watery, fast-absorbing texture

Suited to combination-to-oily skin

Main active: Glycolic Acid and Betaine Salicylate
Intensity: Gentle

PRODUCT DETAILS

Its watery, hydrating texture absorbs quickly with a light finish. The soft consistency settles into a smooth, refreshing feel rather than leaving a heavy layer behind.

Learn more

GOES WELL WITH

2-Step Greenery Calming Ampule Mask$15.99 USD

1% Oligo Hyaluronic Acid Toner$15.99 USD

100 Reedle Shot Stick Pouch$8.09 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Lotion$14.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

1025 Dokdo Cream$24.99 USD

Gentle exfoliation meets a watery, light finish for skin that looks smoother, brighter and more even.

Gentle surface exfoliation
Brighter-looking tone
Light hydration