cosrx The Vitamin C 23 Serum 20ml

A serum with a dense, almost sculptural texture that works quietly. 23% pure ascorbic acid in a 20 ml format designed to get straight to the point — nothing more, nothing less. What it does to the skin shows over time, not in the promise.

Texture and actives — The formula concentrates 23% pure ascorbic acid — a high dose that acts directly on radiance and skin tone evenness, fades acne marks and hyperpigmentation, and supports skin elasticity. It is reinforced by Tocotrienol, a form of vitamin E whose antioxidant activity is fifty times that of classic tocopherol, and which stimulates collagen production. Hyaluronic acid maintains water retention in the upper layers; allantoin soothes the irritation that such a high concentration of vitamin C can cause. Four verifiable actives, zero decorative effect.

In your routine — In the evening, after cleansing and toning, press a pea-sized amount of serum onto the face and neck — the thick texture needs a few seconds of warming between the palms before it sinks in. The next morning, sun protection is essential: ascorbic acid makes skin more sensitive to UV rays. A few weeks are enough to start noticing a difference in skin irregularities and the appearance of fine lines.

• 23% pure ascorbic acid: the concentration is explicitly listed on the supplier's data sheet — it is one of the highest available in the mass market.
• Tocotrienol (Super Vitamin E): antioxidant activity 50 times greater than tocopherol, according to supplier data.
• 20 ml format: ideal for testing the product over 4 to 6 weeks, or for fitting into a travel routine.
• Store away from light and heat to preserve the stability of the ascorbic acid — an opened bottle is best kept in the fridge.
• Compatible with skin that is gradually getting used to high-dose vitamin C: allantoin helps limit any initial discomfort.