The formula goes beyond a single active. Alongside the 23% Ascorbic Acid, it brings in Super Vitamin E in the form of Tocotrienol, which carries significantly stronger antioxidant activity than standard Vitamin E and helps keep the pure Vitamin C stable and effective. Glutathione adds a second layer of brightening support, working through a different mechanism to further address dullness and uneven tone. Sodium Hyaluronate and Panthenol round things out, keeping skin comfortable, hydrated, and well-supported throughout the process.
The results have been clinically measured: a 38% reduction in pore volume and over 92% improvement in skin texture with consistent use. Improved brightness and smoother skin within two weeks, with firmer, more even-toned skin by four weeks.
⚠️ New to Vitamin C?
We'd strongly recommend starting with the COSRX Vitamin C 13 Serum first. It allows your skin to build tolerance gradually before stepping up to this higher concentration, giving you a much better experience and better results in the long run. Think of the C 13 as chapter one — this is chapter two.
What it does for your skin:
Tackles dark spots, post-acne marks, and uneven pigmentation at a higher intensity
Delivers a significant, visible lift in brightness and overall luminosity
Supports collagen production to improve firmness and soften fine lines
Defends against oxidative stress caused by pollution and UV exposure
Refines pores and smooths skin texture with continued use
Hydrates and soothes with Sodium Hyaluronate and Panthenol
Key Ingredients:
- 23% Pure Ascorbic Acid — the gold standard form of Vitamin C for brightening, pigmentation, and collagen support
- Tocotrienol (Super Vitamin E) — a superior form of Vitamin E with powerful antioxidant activity that also helps stabilise the formula
- Glutathione — additional brightening support that works alongside Vitamin C for a more comprehensive effect
- Sodium Hyaluronate — draws moisture deep into the skin to keep it plump and hydrated
- Panthenol (Pro-Vitamin B5) — soothes, supports barrier repair, and reduces potential reactivity
- Niacinamide — refines pores and further evens skin tone
- Squalane — lightweight, non-comedogenic moisture that won't interfere with absorption
- Caffeine — helps reduce puffiness and supports circulation
How to use:
After cleansing and toning, give the bottle a gentle side-to-side shake. Apply 2–3 drops to the face and press in lightly with your fingertips, working from the centre outward. Follow with moisturiser. If using in the morning, SPF 30 or higher is essential — this is non-negotiable with any Vitamin C routine.
If you're stepping up from the C 13, introduce this every second day for the first two to three weeks before moving to daily use. A patch test before first use is always recommended.
💡 Store in the fridge and use within two months of opening to keep your Vitamin C performing at its best. A slight golden tone to the formula is completely normal — it's a sign of real, unmasked Ascorbic Acid at work.
Ingredients:
Water, Ascorbic Acid (23%), 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, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Butylene Glycol, Arginine, Niacinamide, Pentylene Glycol, Alcohol Denat., Helianthus Annuus (Sunflower) Seed Oil, Glycyrrhiza Glabra (Licorice) Root Extract, Methyl Trimethicone, Carthamus Tinctorius (Safflower) Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Beta-Carotene
Fragrance-free | Paraben-free | Cruelty-free | Suitable for all skin types