Advanced The Vitamin C 23 Serum
Serum · 20 mL
Where to buy
Stylevana
20 mL
20%$20.00$25.00Buy at StylevanaYesStyle
20 mL
20%$20.00$25.00Buy at YesStyleDODOSKIN
20 mL
30%$20.59$29.25Buy at DODOSKIN
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Key ingredients
Found in the full ingredient list below. Check how it layers with your routine
Full ingredients (30)
- 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
Listed from highest to lowest concentration. Formulas change, so check the packaging if you avoid an ingredient.
Product details
High-potency vitamin C
23% pure vitamin C with super vitamin E and hyaluronic acid, for skin that looks brighter, more even and more radiant.
COSRX’s most powerful vitamin C serum is built around pure ascorbic acid, the second ingredient on the list. A dual-layer formula pairs it with an antioxidant team of tocotrienols, tocopherol and glutathione, plus panthenol, hyaluronic acid and allantoin to keep skin comfortable.
- Pure vitamin C (ascorbic acid)
- 23%
- Pure vitamin C (ascorbic acid)
- Shake gently to mix before each use
- Dual layer
- Shake gently to mix before each use
- Keep it in the fridge once opened
- 3–10°C
- Keep it in the fridge once opened
What’s inside
The ingredients doing the work
Pure vitamin C
High-strength ascorbic acid, backed by a stable vitamin C derivative, to help brighten dull skin, even out tone and fade the look of dark spots.
No. 2, 6 of 30 on the list
Antioxidant synergy
Super vitamin E (tocotrienols), vitamin E and glutathione work alongside vitamin C to help defend skin against daily stress.
No. 17, 18, 23 of 30 on the list
Firming + brightening
Adenosine helps skin look firmer and smoother, while niacinamide adds a further brightening boost.
No. 12, 21 of 30 on the list
Moisture + soothing
Gentle hydration and calming care, so a powerful vitamin C stays comfortable on skin.
No. 5, 10, 15 of 30 on the list
Supporting botanicals
- Gardenia fruit
- Camellia seed oil
- Carrot root
- Licorice root
- Sunflower seed oil
- Safflower seed oil
How to use
After toner
- 1
Mix
With the dropper fastened, shake the bottle lightly from left to right to blend the two layers.
- 2
Drop
After cleansing and toning, dispense a few drops of the golden serum.
- 3
Smooth
Spread it evenly over the face and pat gently until absorbed.
- 4
Seal
Follow with moisturizer, and sunscreen by day. Return the bottle upright to the fridge.
Brighter, more even-looking skin
One concentrated drop of pure vitamin C for the days skin looks dull and uneven.
Good to know
- A high-strength pure vitamin C. COSRX suggests its gentler Vitamin C 13 Serum for vitamin C beginners.
- Vitamin C can give off gas, so the cap may make a sound when opened. Don’t shake hard before opening, or it may overflow.
- Keep refrigerated (3–10°C), upright, away from heat and direct sunlight, and use within 2 months of opening, as vitamin C discolours as it oxidises.
- Wear sunscreen during the day while using it.
- Comes in a 20 mL bottle.