COSRX Advanced The Vitamin C 23 Serum 20ml

COSRX / Serums

COSRX Advanced The Vitamin C 23 Serum 20ml

$38.95

COSRX Advanced The Vitamin C 23 Serum is a high-potency brightening serum with 23% pure Vitamin C, Super Vitamin E (Tocotrienol), and Glutathione — clinically proven to fade dark spots, refine texture, and deliver a radiant, even complexion. 20ml.

23% Pure Vitamin C (Ascorbic Acid)
Super Vitamin E (Tocotrienol) — 50× More Potent Than Standard Vitamin E
Glutathione for Brightening
Clinically Proven: 100% Improvement in Brightness & Firmness
Store Refrigerated After Opening

What It Is

A high-potency brightening serum with 23% pure Vitamin C (Ascorbic Acid), Super Vitamin E (Tocotrienol), and Glutathione — clinically proven to fade dark spots, even skin tone, and deliver firmer, more radiant skin.

Why It's Different

Super Vitamin E (Tocotrienol) provides up to 50× greater antioxidant efficacy than standard Vitamin E, helping to stabilise the inherently unstable pure Vitamin C for better delivery and less irritation.

Who it's For

Experienced Vitamin C users seeking maximum brightening efficacy — targeting hyperpigmentation, dullness, early ageing, and uneven tone.

Ingredients

Ascorbic Acid (23%), Propylene Glycol, Tocotrienol (Super Vitamin E), Glutathione, Hyaluronic Acid, Allantoin, 3-O-Ethyl Ascorbic Acid, Sodium Hyaluronate

How to Use

After cleansing and toning, apply 2–3 drops to the entire face. Pat gently for better absorption. Follow with moisturiser and SPF during the day. Do not mix with retinol or acids in the same step. Store refrigerated after opening.

Bonza Nourishing

Skin-Beautifying Ingredients

Glutathione

Improve uneven skin tone and reduces dullness for a healthy glow

Hyaluronic Acid

Intensely Hydrates, Plumps, and Locks in Moisture

Sodium Hyaluronate

Hydrates and plumps the skin, reducing fine lines.

Niacinamide

Improves skin texture, reduces redness and inflammation, and minimizes pores

Allantoin

Calms irritated skin and helps reduce signs of sensitivity

Add a product

Add a product

Add a product

Add a product

Add a product

Frequently asked questions

Why does the serum have a yellowish tint?

The yellow colour is natural and indicates the presence of pure Vitamin C and oil. It confirms the active ingredients are present and potent.

Do I need to refrigerate it?

Yes — store upright in the refrigerator at 3–10°C once opened to protect the active Vitamin C from oxidation. Use within 2 months of opening.

Can I use it if I have sensitive skin?

At 23%, this is a high-concentration product recommended for experienced Vitamin C users. Patch test first. If irritation occurs, use every other day or reduce frequency before increasing.

What should I not mix with this serum?

Avoid using with AHA, BHA, or retinol in the same routine step as this may cause irritation. It pairs well with Hyaluronic Acid, Ceramides, Snail Mucin, and Centella.

Can I use it in the morning?

Yes — this serum can be used morning or evening. If used in the morning, always follow with SPF 30 or higher to protect your skin from UV exposure.

See LashViva in Action: Transform Your Lashes Today!

Discover the secret to stunning, natural lashes with LashViva Eyelash Serum. Watch our quick video to see real results and learn how this powerful serum can elevate your beauty routine. Click to explore and enhance your lash game now!

Shop Now

Real Results: LashViva Transformations Unveiled!

See how everyday users achieve longer, fuller lashes and discover how you can too. Click to explore and be inspired by real transformations!

Shop Now

Experience Deep Hydration: Hyaluronic Serum Revealed!

Explore authentic user experiences with Eastern Curlew's Hyaluronic Serum. Watch how real people achieve deeply hydrated, luminous skin. Click to learn more and start your journey to glowing skin!

Shop Now

Timeless Beauty: Experience YouthBloomer Elegance!

Transform your skincare routine with the YouthBloomer Pure Elegance Set. Our video highlights the set's nourishing and revitalizing effects, perfect for achieving a youthful glow. Click to learn more and indulge in elegance!

Shop Now

See LashViva in Action: Transform Your Lashes Today!

Discover the secret to stunning, natural lashes with LashViva Eyelash Serum. Watch our quick video to see real results and learn how this powerful serum can elevate your beauty routine. Click to explore and enhance your lash game now!

Shop Now

Real Results: LashViva Transformations Unveiled!

See how everyday users achieve longer, fuller lashes and discover how you can too. Click to explore and be inspired by real transformations!

Shop Now

Experience Deep Hydration: Hyaluronic Serum Revealed!

Explore authentic user experiences with Eastern Curlew's Hyaluronic Serum. Watch how real people achieve deeply hydrated, luminous skin. Click to learn more and start your journey to glowing skin!

Shop Now

Timeless Beauty: Experience YouthBloomer Elegance!

Transform your skincare routine with the YouthBloomer Pure Elegance Set. Our video highlights the set's nourishing and revitalizing effects, perfect for achieving a youthful glow. Click to learn more and indulge in elegance!

Shop Now

Your Order

COSRX Advanced The Vitamin C 23 Serum 20ml

Your Skincare Routine

Frequently asked questions

Let customers speak for us

Your Order

You might like

COSRX Advanced The Vitamin C 23 Serum 20ml

Your Skincare Routine

Frequently asked questions

Let customers speak for us