[Cosrx] The Alpha-Arbutin 2 Discoloration Care Serum 50ml

Product Overview

A concentrated pigmentation serum designed to support the appearance of post-blemish marks, dark spots, uneven-looking skin tone and persistent discoloration.

The formula combines 2% alpha-arbutin with niacinamide, tranexamic acid and acetyl glucosamine, supported by licorice root extract, glutathione and ferulic acid.

Unlike a single-ingredient brightening serum, this formula approaches uneven tone through several complementary cosmetic pathways while incorporating multiple forms of hyaluronic acid, panthenol, allantoin and madecassoside for hydration and skin-conditioning support.

Within the Glass Ritual Pigmentation Collection, this occupies the targeted discoloration-treatment stage.

Why We Chose It

We chose the COSRX The Alpha-Arbutin 2 Discoloration Care Serum because it provides one of the collection's more comprehensive formulas specifically focused on visible discoloration.

Its treatment system brings together:

2% Alpha-Arbutin + Niacinamide + Tranexamic Acid + Acetyl Glucosamine

Rather than relying on alpha-arbutin alone, the formula combines several well-established cosmetic ingredients used to support a brighter and more even-looking complexion.

It also includes licorice root extract, glutathione and ferulic acid, adding antioxidant and tone-supporting care.

Multiple forms of hyaluronic acid, panthenol, allantoin and madecassoside help balance the treatment system with hydration and skin-conditioning support.

This makes it particularly relevant for practitioners whose main concern is persistent-looking post-blemish discoloration or uneven tone rather than general radiance alone.

Benefits

• Contains 2% alpha-arbutin
• Helps improve the appearance of visible dark spots
• Helps improve the appearance of post-blemish marks
• Supports a more even-looking skin tone
• Helps improve dullness and overall radiance
• Contains tranexamic acid
• Niacinamide provides tone and barrier support
• Acetyl glucosamine complements the pigmentation-care system
• Licorice root extract provides additional tone-supporting care
• Glutathione and ferulic acid provide antioxidant support
• Multiple forms of hyaluronic acid support hydration
• Panthenol and allantoin provide skin-conditioning support
• Madecassoside provides soothing support

Who It's For

Consider this serum if you are concerned about:

• Post-blemish dark marks
• Visible dark spots
• Uneven-looking skin tone
• Persistent discoloration
• Dull-looking skin
• Uneven tone associated with previous sun exposure
• Wanting a targeted alpha-arbutin treatment
• Wanting several complementary pigmentation-supporting ingredients in one serum

Persistent, changing or unexplained pigmentation should be assessed appropriately rather than assumed to be purely cosmetic.

How to Use

After cleansing and toning, apply an appropriate amount evenly over the skin.

Allow the serum to absorb before applying moisturiser.

For areas requiring more targeted cosmetic care, the manufacturer indicates that the serum can be layered 2–3 times as needed.

When used during the daytime, finish the routine with appropriate sun protection.

If you are new to targeted pigmentation treatments, introduce the serum gradually and observe how your skin responds.

Ritual Position

Cleanse → Tone → COSRX Alpha-Arbutin 2 Discoloration Care Serum → Moisturise → Sunscreen during the day

This occupies the targeted pigmentation-serum stage of the Glass Ritual.

Glass Ritual Pairing

Because this serum already combines alpha-arbutin, tranexamic acid, niacinamide and acetyl glucosamine, it does not automatically need to be layered with several additional pigmentation serums.

A deliberate routine could be:

Gentle Cleanser → Hydrating Toner → COSRX Alpha-Arbutin 2 Discoloration Care Serum → Barrier-Supportive Moisturiser → Sunscreen

Practitioners using vitamin C, retinoids or exfoliating acids elsewhere in their routine can introduce combinations according to tolerance rather than placing every active into the same application.

Within the Pigmentation Collection, this product has a particularly clear role:

COSRX Vitamin C 23 Serum → high-strength vitamin C treatment.

COSRX Alpha-Arbutin 2 Discoloration Care Serum → multi-pathway targeted discoloration treatment built around alpha-arbutin, tranexamic acid and niacinamide.

They do not need to be used together simply because both address pigmentation.

Glass Ritual Principle: Target the concern deliberately. More brightening products do not automatically mean better pigmentation care.

Key Ingredients

Alpha-Arbutin — 2%
A targeted brightening ingredient that helps improve the appearance of dark spots and uneven-looking pigmentation.

Tranexamic Acid
Supports a more even-looking complexion and complements alpha-arbutin within the formula's pigmentation-care system.

Niacinamide
Supports brighter, more even-looking skin while contributing to healthy barrier function.

Acetyl Glucosamine
Provides skin-conditioning and tone-supporting care and works particularly well alongside niacinamide.

Licorice Root Extract
Provides soothing, antioxidant and tone-supporting properties.

Glutathione
Provides antioxidant support and complements the formula's brightening system.

Ferulic Acid + Tocopherol
Provide additional antioxidant support.

Multi-Hyaluronic Acid Complex
Includes Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate Crosspolymer, Hyaluronic Acid and Sodium Acetylated Hyaluronate to support hydration.

Madecassoside + Panthenol + Allantoin
Provide soothing, hydrating and skin-conditioning support.

Full Ingredients

Aqua/Water, Propanediol, Glycerin, Niacinamide, Tranexamic Acid, Acetyl Glucosamine, Alpha-Arbutin (2%), 1,2-Hexanediol, Dimethicone, Dimethyl Isosorbide, Diethoxyethyl Succinate, Butylene Glycol, Citric Acid, Alcohol, Sodium Polyacryloyldimethyl Taurate, Hydrogenated Lecithin, Xanthan Gum, Sodium Metabisulfite, Disodium EDTA, Ethylhexylglycerin, Dextrin, Theobroma Cacao (Cocoa) Extract, Sodium Citrate, Madecassoside, Sodium Methyl Stearoyl Taurate, Sodium Hyaluronate, Tocopherol, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate Crosspolymer, Hyaluronic Acid, Ferulic Acid, Glycyrrhiza Glabra (Licorice) Root Extract, Panthenol, Arginine, Methyl Trimethicone, Allantoin, Glutathione, Sodium Acetylated Hyaluronate.

Safety & Ingredient Information

For external use only. Avoid direct contact with the eyes and discontinue use if persistent irritation occurs.

The formula contains 2% alpha-arbutin alongside tranexamic acid, niacinamide and other tone-supporting ingredients. Introduce other intensive active treatments gradually rather than assuming that multiple pigmentation treatments need to be layered together.

The formula contains alcohol, although it appears below several of the principal treatment ingredients. Practitioners who know their skin is particularly reactive to alcohol-containing formulations should take this into consideration.

Consistent daytime sun protection is particularly important when managing the appearance of pigmentation, because ongoing UV exposure can contribute to visible uneven tone.

Ingredient formulations can change over time. Always check the ingredient list printed on the specific product received if you have known allergies or sensitivities.

Glass Ritual positions COSRX The Alpha-Arbutin 2 Discoloration Care Serum as a cosmetic serum designed to help improve the appearance of post-blemish marks, dark spots, dullness and uneven-looking skin tone. It is not positioned as a treatment for melasma, hormonal disorders or another medical pigmentation condition.