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COSRX Advanced The Vitamin C 23 Serum bottle featuring Super Vitamin E and Hyaluronic Acid; high-potency 23% stabilized Vitamin C formulation designed to brighten dull skin, refine pores, and even skin tone while hydrating; minimal modern K-beauty packaging emphasizing clinical-grade clarity and gentle brightening care.
COSRX Advanced The Vitamin C 23 Serum displayed on an icy blue background with clinical proof badges for non-comedogenic, antioxidant, and clinically proven results; formulated with 23% pure Vitamin C to visibly improve tone, glow, and texture while reducing dark spots and refining pores.
Updated COSRX Advanced The Vitamin C 23 Serum dropper shown releasing golden drops; upgraded dual-layer formula with Super Vitamin E and Hyaluronic Acid offers stronger clinical efficacy, brightening dark spots, and smoothing rough texture for luminous, even skin tone.
COSRX Advanced The Vitamin C 23 Serum clinical results infographic showing 100% improvement in brightness, firmness, texture refinement, and skin transparency; proven to make skin clearer and smoother after consistent use, reducing dullness and fine lines with visible tone-evening benefits.
Clinically proven COSRX Advanced The Vitamin C 23 Serum bottle held in hand, highlighting benefits including antioxidant action, pigmentation reduction, refined pores, improved texture, and radiance; validated by Dermacosmetic Skin Science Lab for clearer, brighter, and firmer skin.
Set of COSRX Advanced The Vitamin C 23 Serum bottles with golden background highlighting 23% pure Vitamin C, antioxidant synergy for early-aging prevention, and dual-layer hydration; designed to visibly brighten tone, smooth texture, and reduce hyperpigmentation and pore appearance.
Visual of pure ascorbic acid droplets representing the key ingredient in COSRX Advanced The Vitamin C 23 Serum; high-concentration Vitamin C delivers antioxidant, brightening, and firming benefits, helping even skin tone, fade dark spots, and restore healthy glow.
Before-and-after photos from COSRX Advanced The Vitamin C 23 Serum clinical study showing visible reduction in blemishes and pigmentation after 4 weeks; results include -17.43% surface pigmentation and +5.02% tone improvement, backed by Dermacosmetic Skin Science Lab testing.
COSRX Advanced The Vitamin C 23 Serum clinical data showing +92.32% improvement in skin texture and +34.81% radiance and brightening; proven to reduce redness by 30.14% and enhance clarity, offering smoother, even-toned, luminous skin through stabilized Vitamin C care.
Golden liquid illustration featuring COSRX Advanced The Vitamin C 23 Serum dropper with antioxidant synergy callouts; highlights hydration, soothing, firmness, and brightening benefits for early-aging prevention and texture improvement through 23% pure Vitamin C and Vitamin E blend.
COSRX Advanced The Vitamin C 23 Serum ingredient chart showing antioxidant synergy with Vitamin E, Tocopherol, and Glutathione; firmness and brightening benefits with Adenosine and Niacinamide; and moisture-soothing blend with Panthenol, Hyaluronic Acid, and Allantoin for radiant, even-toned skin.
Clinically proven COSRX Advanced The Vitamin C 23 Serum demonstrated -12.16% wrinkle reduction around eyes and improved elasticity up to -15.07%; shown applied by model with luminous skin, highlighting serum’s ability to firm, smooth, and refine early-aging texture.
Before-and-after clinical comparison showing visible pore reduction after 4 weeks of using COSRX Advanced The Vitamin C 23 Serum; results include -38.15% pore volume and -36.05% pore area, improving firmness, texture smoothness, and evenness of skin tone.
Visual breakdown of COSRX Pure Vitamin C features, real pure Vitamin C, 23% high concentration, and optimal pH balance, ensuring fast antioxidant benefits, brightening results, and stabilized efficacy for comfortable, irritation-free use on sensitive skin.
Illustration of COSRX Advanced The Vitamin C 23 Serum’s antioxidant action showing golden Vitamin C molecules protecting skin layers from oxidative stress; clinically proven to defend against daily environmental damage and promote youthful radiance and smooth texture.
Close-up of COSRX Advanced The Vitamin C 23 Serum dropper with golden dual-layered formula; stabilized oil and water layers designed to minimize skin burden while delivering a soft, bouncy finish that hydrates and refines skin texture.
COSRX Advanced The Vitamin C 23 Serum bottle shown under frosted glass highlighting its non-comedogenic and sensitive skin irritation-tested formula; gentle derma-grade serum providing brightening and pore-refining results without redness or discomfort.
COSRX Advanced The Vitamin C 23 Serum packaging breakdown with gas-controlling cap, oxidation-preventing container, and hygienic dropper; specialized K-beauty design maintaining 23% pure Vitamin C freshness and stability for consistent tone-brightening results.
Comparison chart between COSRX Vitamin C 13 Serum for daily brightening and COSRX Advanced The Vitamin C 23 Serum for intensive antioxidant care; emphasizes dual-layer nourishment, higher concentration, and visible dark spot fading benefits.
Step-by-step visual guide showing application of COSRX Advanced The Vitamin C 23 Serum; instructions include refrigerating after opening, shaking lightly, and applying a few drops post-toner for optimal brightening, texture improvement, and pore refinement.
COSRX Advanced The Vitamin C 23 Serum bottle featuring Super Vitamin E and Hyaluronic Acid; high-potency 23% stabilized Vitamin C formulation designed to brighten dull skin, refine pores, and even skin tone while hydrating; minimal modern K-beauty packaging emphasizing clinical-grade clarity and gentle brightening care.
COSRX Advanced The Vitamin C 23 Serum displayed on an icy blue background with clinical proof badges for non-comedogenic, antioxidant, and clinically proven results; formulated with 23% pure Vitamin C to visibly improve tone, glow, and texture while reducing dark spots and refining pores.
Updated COSRX Advanced The Vitamin C 23 Serum dropper shown releasing golden drops; upgraded dual-layer formula with Super Vitamin E and Hyaluronic Acid offers stronger clinical efficacy, brightening dark spots, and smoothing rough texture for luminous, even skin tone.
COSRX Advanced The Vitamin C 23 Serum clinical results infographic showing 100% improvement in brightness, firmness, texture refinement, and skin transparency; proven to make skin clearer and smoother after consistent use, reducing dullness and fine lines with visible tone-evening benefits.
Clinically proven COSRX Advanced The Vitamin C 23 Serum bottle held in hand, highlighting benefits including antioxidant action, pigmentation reduction, refined pores, improved texture, and radiance; validated by Dermacosmetic Skin Science Lab for clearer, brighter, and firmer skin.
Set of COSRX Advanced The Vitamin C 23 Serum bottles with golden background highlighting 23% pure Vitamin C, antioxidant synergy for early-aging prevention, and dual-layer hydration; designed to visibly brighten tone, smooth texture, and reduce hyperpigmentation and pore appearance.
Visual of pure ascorbic acid droplets representing the key ingredient in COSRX Advanced The Vitamin C 23 Serum; high-concentration Vitamin C delivers antioxidant, brightening, and firming benefits, helping even skin tone, fade dark spots, and restore healthy glow.
Before-and-after photos from COSRX Advanced The Vitamin C 23 Serum clinical study showing visible reduction in blemishes and pigmentation after 4 weeks; results include -17.43% surface pigmentation and +5.02% tone improvement, backed by Dermacosmetic Skin Science Lab testing.
COSRX Advanced The Vitamin C 23 Serum clinical data showing +92.32% improvement in skin texture and +34.81% radiance and brightening; proven to reduce redness by 30.14% and enhance clarity, offering smoother, even-toned, luminous skin through stabilized Vitamin C care.
Golden liquid illustration featuring COSRX Advanced The Vitamin C 23 Serum dropper with antioxidant synergy callouts; highlights hydration, soothing, firmness, and brightening benefits for early-aging prevention and texture improvement through 23% pure Vitamin C and Vitamin E blend.
COSRX Advanced The Vitamin C 23 Serum ingredient chart showing antioxidant synergy with Vitamin E, Tocopherol, and Glutathione; firmness and brightening benefits with Adenosine and Niacinamide; and moisture-soothing blend with Panthenol, Hyaluronic Acid, and Allantoin for radiant, even-toned skin.
Clinically proven COSRX Advanced The Vitamin C 23 Serum demonstrated -12.16% wrinkle reduction around eyes and improved elasticity up to -15.07%; shown applied by model with luminous skin, highlighting serum’s ability to firm, smooth, and refine early-aging texture.
Before-and-after clinical comparison showing visible pore reduction after 4 weeks of using COSRX Advanced The Vitamin C 23 Serum; results include -38.15% pore volume and -36.05% pore area, improving firmness, texture smoothness, and evenness of skin tone.
Visual breakdown of COSRX Pure Vitamin C features, real pure Vitamin C, 23% high concentration, and optimal pH balance, ensuring fast antioxidant benefits, brightening results, and stabilized efficacy for comfortable, irritation-free use on sensitive skin.
Illustration of COSRX Advanced The Vitamin C 23 Serum’s antioxidant action showing golden Vitamin C molecules protecting skin layers from oxidative stress; clinically proven to defend against daily environmental damage and promote youthful radiance and smooth texture.
Close-up of COSRX Advanced The Vitamin C 23 Serum dropper with golden dual-layered formula; stabilized oil and water layers designed to minimize skin burden while delivering a soft, bouncy finish that hydrates and refines skin texture.
COSRX Advanced The Vitamin C 23 Serum bottle shown under frosted glass highlighting its non-comedogenic and sensitive skin irritation-tested formula; gentle derma-grade serum providing brightening and pore-refining results without redness or discomfort.
COSRX Advanced The Vitamin C 23 Serum packaging breakdown with gas-controlling cap, oxidation-preventing container, and hygienic dropper; specialized K-beauty design maintaining 23% pure Vitamin C freshness and stability for consistent tone-brightening results.
Comparison chart between COSRX Vitamin C 13 Serum for daily brightening and COSRX Advanced The Vitamin C 23 Serum for intensive antioxidant care; emphasizes dual-layer nourishment, higher concentration, and visible dark spot fading benefits.
Step-by-step visual guide showing application of COSRX Advanced The Vitamin C 23 Serum; instructions include refrigerating after opening, shaking lightly, and applying a few drops post-toner for optimal brightening, texture improvement, and pore refinement.

(Free Gift) Advanced The Vitamin C 23 Serum

$25.00

Power-Brightening Pure Vitamin C Serum

COSRX’s Advanced The Vitamin C 23 Serum features a high strength 23% pure vitamin C with Super Vitamin E and Glutathione to target uneven skin tone, early signs of aging, and dullness. Ideal for experienced vitamin C users seeking visible brightening and firmer skin, it absorbs smoothly to leave the complexion more radiant, supple, and revitalized.

Size: 20ml / 0.67fl. oz

Not available at COSRX.COM

After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side and apply a few drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges.


/KEEP REFRIGERATED (3~10°C)/
*Please use immediately after purchase and store upright in refrigerator once opened. 


👉 Cautions to read (click)


*Cautions*
1. For the first use, attach the enclosed dropper in the product package.
2. Recommended to use within 2 months of opening due to active ingredient protection. 
3. Highly concentrated serum should only be used in the evening? NO! This serum can be used in the morning and/or afternoon.
4. If applied in the morning, be sure to use with a SPF of 30 or higher.
5. As this is a high-concentration Vitamin C formulation, please avoid using it together with Copper Peptide products, including our Blue Peptide Serum & Cream. We recommend using them at different times of the day (morning/evening) to help optimize absorption and maximize the benefits of each product.

After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side and apply a few drops to the skin. Use fingertips to gently massage and absorb the se8rum, starting from the inside of the face working towards the edges.


/KEEP REFRIGERATED (3~10°C)/
*Please use immediately after purchase and store upright in refrigerator once opened. 


👉 Cautions to read (click)


* For the first use, attach the enclosed dropper in the product package.
* Recommended to use within 2 months of opening due to active ingredient protection. 
* Highly concentrated serum should only be used in the evening? NO! This serum can be used in the morning and/or afternoon.
* If applied in the morning, be sure to use with a SPF of 30 or higher.
*As this is a high-concentration Vitamin C formulation, please avoid using it together with Copper Peptide products, including our Blue Peptide Serum & Cream. We recommend using them at different times of the day (morning/evening) to help optimize absorption and maximize the benefits of each product.

KEY INGREDIENTS
• 23% Pure Vitamin C (Ascorbic acid) :
Antioxidant activity, brightening(improve blemishes and brighten skin), reduce wrinkles and enhance elasticity.
💡Learn More about Vitamin C →


• Super vitamin E(Tocotrienol) :
50 times higher antioxidant activities than tocopherol, stimulate collagen production.


• Glutathione :
Helps brighten dull skin and support antioxidant protection.


• Adenosine :
Helps improve the look of wrinkles and enhance skin elasticity.

×

Full Ingredients

Aqua/Water, Ascorbic Acid(23%), Butylene Glycol, Dimethicone, Panthenol, 3-O-Ethyl Ascorbic Acid, Squalane, Sodium Hydroxide, Caffeine, Sodium Hyaluronate, Sodium Metaphosphate, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glutathione, Helianthus Annuus (Sunflower) Seed Oil, Methyl Trimethicone, Carthamus Tinctorius (Safflower) Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Beta-Carotene

DETAILS
HOW TO USE
INGREDIENTS

After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side and apply a few drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face working towards the edges.


/KEEP REFRIGERATED (3~10°C)/
*Please use immediately after purchase and store upright in refrigerator once opened. 


👉 Cautions to read (click)


*Cautions*
1. For the first use, attach the enclosed dropper in the product package.
2. Recommended to use within 2 months of opening due to active ingredient protection. 
3. Highly concentrated serum should only be used in the evening? NO! This serum can be used in the morning and/or afternoon.
4. If applied in the morning, be sure to use with a SPF of 30 or higher.
5. As this is a high-concentration Vitamin C formulation, please avoid using it together with Copper Peptide products, including our Blue Peptide Serum & Cream. We recommend using them at different times of the day (morning/evening) to help optimize absorption and maximize the benefits of each product.

After cleansing, during the serum phase, shake the bottle lightly once or twice from side to side and apply a few drops to the skin. Use fingertips to gently massage and absorb the se8rum, starting from the inside of the face working towards the edges.


/KEEP REFRIGERATED (3~10°C)/
*Please use immediately after purchase and store upright in refrigerator once opened. 


👉 Cautions to read (click)


* For the first use, attach the enclosed dropper in the product package.
* Recommended to use within 2 months of opening due to active ingredient protection. 
* Highly concentrated serum should only be used in the evening? NO! This serum can be used in the morning and/or afternoon.
* If applied in the morning, be sure to use with a SPF of 30 or higher.
*As this is a high-concentration Vitamin C formulation, please avoid using it together with Copper Peptide products, including our Blue Peptide Serum & Cream. We recommend using them at different times of the day (morning/evening) to help optimize absorption and maximize the benefits of each product.

KEY INGREDIENTS
• 23% Pure Vitamin C (Ascorbic acid) :
Antioxidant activity, brightening(improve blemishes and brighten skin), reduce wrinkles and enhance elasticity.
💡Learn More about Vitamin C →


• Super vitamin E(Tocotrienol) :
50 times higher antioxidant activities than tocopherol, stimulate collagen production.


• Glutathione :
Helps brighten dull skin and support antioxidant protection.


• Adenosine :
Helps improve the look of wrinkles and enhance skin elasticity.

×

Full Ingredients

Aqua/Water, Ascorbic Acid(23%), Butylene Glycol, Dimethicone, Panthenol, 3-O-Ethyl Ascorbic Acid, Squalane, Sodium Hydroxide, Caffeine, Sodium Hyaluronate, Sodium Metaphosphate, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Arginine, Niacinamide, Pentylene Glycol, Glutathione, Helianthus Annuus (Sunflower) Seed Oil, Methyl Trimethicone, Carthamus Tinctorius (Safflower) Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Beta-Carotene

More details Right

Overall rating: 4.25816 / 5 from 2022 reviews.

AI Generated Review Summary

COSRX's Advanced The Vitamin C 23 Serum offers a high concentration of pure vitamin C, praised for its brightening effects and smooth texture. While many customers report positive results and a radiant appearance, some have noted irritation and dryness. The product absorbs quickly and is generally well-received for its hydrating and moisturizing properties.

Summary topics

  • Results (7%): Customers loved the results, with many describing it as amazing, great, and the best they've experienced.
  • Looks (7%): Customers appreciated how this product made their skin look radiant, healthy, and hydrated, with a unique smell.
  • Texture (6%): It was observed by customers that the texture of the product is highly praised for being nice, smooth, and moisturizing.
  • Feels (15%): Many customers appreciated how the product feels on their skin, describing it as nice, smooth, and hydrated.
  • Absorbs (6%): It was noted by customers that the product absorbs quickly into the skin, which is a common opinion.

Review topics: ["color","feels","packaging","issues","skin","looks","results","shipping","absorbs","texture","face","price","spots","bottle","consistency","serum","glow","formula","quality","vitamin c","ingredients","improvement","irritation","difference","weight","fragrance","wrinkles","works","pores","residue"].

Review highlights

  • "My skin looks brighter and feels great after using this product for just a couple weeks." — Jenilee
  • "great price, works great , have seen immediate results, skin feels and looks smoother" — Hamid Z.
  • "My skin felt super hydrated and bright - the mix of the vitamin C, E and hyaluronic acid was great for my skin!" — Mommysbeautyreviews

Reviews

I honestly wish I had

"I honestly wish I had taken a picture of my skin prior to using your product. But let me tell you there is such a difference and I’m ecstatic. They finally I have found something that’s gonna help. I have taken care of my skin, my whole life and within the last year, I have received horrible allergic reaction reactions that left scarring and this is devastating to me. A coworker shared your product and I had nothing to lose. I can’t tell you how I feel seeing my face almost being back to normal the same clear skin that I have taken care of for so many years all I can say is thank you"

— Debora M. (5/5)

I've been using this one

"I've been using this one and it's not really harsh on the skin and it doesn't have any smell anymore like they did before. It's really nice that they upgraded the formula and listened to their consumers. It helps with my skin especially with acne scars. The packaging looks really nice as well and they gave me a free gift of pimple patches. Will be ordering these again."

— Angela G. (5/5)

Love this! Gentle on my

"Love this! Gentle on my skin and a great price point"

— Christina R. (5/5)

It's the number one product

"It's the number one product for my skincare routine. I love COSRX"

— Evelyn D. (5/5)

Haven’t used yet but as

"Haven’t used yet but as all Cosrx products I’m sure it s terrific"

— jacqueline h. (4/5)

"Utilizo los productos se Cosrx y los ordeno por amazon, esta ves los compre directamente desde la web y llego dañada"

— Alejandra (2/5)

Even skin tone

"I have noticed a different in my skin since using this product. I have noticed the brightening effects. My skin tone is more even with less dark spots. While I do not store the product in the fridge one it is opened, I store my unopened products in the fridge. I made the mistake of leaving an unopened one in a cabinet. It evaporated within 2 months."

— Chikanele O. (5/5)

Great product, skin glows

"I have used other Serum Vitamin C brands, when I first put this in a little goes a long way. My skin felt refreshed and hydrated. I’ve noticed my dark spots are somewhat lighter. My granddaughters remarked on how my skin glows. Truly a great and worthwhile product that definitely won’t break the bank. l"

— Terri T. (5/5)

I love this Vitamin C.

"I love this Vitamin C. My husband and I are using it since we got our first bottle in Seoul and we even recommended it to our families."

— Migzy U. (5/5)

The Vitamin C serum by

"The Vitamin C serum by Cos-Rx is by far the best product with the most noticeable results that I have found. I love this product and this brand."

— Cheryl K. (5/5)

Q&A