COSRX The Vitamin C 23 Serum 20g

If your skin looks dull or uneven and you want a strong vitamin C step to bring back some radiance, this is one of the higher-strength options out there. This COSRX Canada favourite is a serum with 23% pure vitamin C that helps skin look brighter and supports a more even-looking complexion. It is best added in the morning as a targeted brightening step before your moisturizer and sunscreen.

What makes it stand out is the high concentration paired with supporting ingredients. The 23% vitamin C works alongside a vitamin E derivative and glutathione for antioxidant care, plus sodium hyaluronate and panthenol to keep skin feeling hydrated and comfortable. The texture is lightweight and slightly silky, and it absorbs without feeling heavy.

This is a strong formula, so it suits people who are already comfortable using vitamin C and want a higher-strength serum. A practical tip: introduce it slowly, patch test first, and always wear sunscreen during the day. If your skin is very sensitive or new to vitamin C, a gentler, lower-strength serum may be a better place to start, since a potent vitamin C can tingle.

Features:

• The high-strength 23% vitamin C is aimed at a brighter, more radiant look.

• A vitamin E derivative and glutathione add antioxidant support.

• Sodium hyaluronate and panthenol help keep skin feeling hydrated and comfortable.

• The texture is lightweight and silky, absorbing without a heavy feel.

• The dark glass bottle and dropper help protect the vitamin C and make it easy to dose.

• A potent formula, so a little goes a long way each morning.

Concerns:

• Dull, tired-looking skin

• Uneven-looking skin tone

• Skin that looks like it has lost some radiance

• A want for a higher-strength brightening step

Suitable For:

• Normal, combination, and oily skin

• People already comfortable using vitamin C

• Skin that wants a brightening, radiance-focused serum

• Not ideal for very sensitive skin or vitamin C beginners

Made In:

• South Korea

• The high vitamin C concentration gives a strong brightening step for skin that looks dull and tired.

• Pairing vitamin C with a vitamin E derivative and glutathione adds antioxidant care for a fresher look.

• Sodium hyaluronate helps keep skin feeling hydrated, so the potent formula stays more comfortable.

• The lightweight texture absorbs quickly, so it layers easily under moisturizer and sunscreen.

• Used each morning, it supports a brighter, more even-looking complexion over time.

• The protective dark bottle and small size help you use it up while it is fresh.

1. Patch test first, and start with every other morning if your skin is new to strong vitamin C.

2. Cleanse and tone, then gently shake the bottle once or twice.

3. Apply two to three drops to your face, avoiding the eye area.

4. Pat gently and let it absorb for a minute or two.

5. Follow with moisturizer, and always apply sunscreen as your last morning step.

6. Use it in the morning, and store it somewhere cool to help keep it fresh.

Key Ingredients:

• Ascorbic Acid (23% Pure Vitamin C): The high-strength star ingredient, for a brighter, more radiant look.

• Tocotrienol/Tocopherol (Vitamin E): An antioxidant that works alongside vitamin C.

• Glutathione: An antioxidant ingredient that supports the brightening focus.

• Sodium Hyaluronate: A humectant that helps skin feel hydrated.

• Panthenol and Allantoin: Soothing ingredients that help skin feel comfortable.

Ingredient Claims:

• Fragrance-Free

• Paraben-Free

• Sulfate-Free

• Mineral Oil-Free

Full Ingredients List:

Water, Ascorbic Acid, Propanediol, Dimethicone, Tromethamine, Panthenol, Ethyl Ascorbyl Ether, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract

• COSRX The Vitamin C 23 Serum (KR version)

• 20 g

• 1 dark glass bottle with dropper

• Outer box and inner seal