COSRX The Vitamin C 13 Serum 20ml, 2-Pack

Features

COSRX The Vitamin C 13 Serum is a daily moisture-toning booster designed for those seeking an effective yet gentle introduction to pure vitamin C. Formulated with 13% pure Vitamin C, this serum provides powerful antioxidant, brightening, and anti-aging benefits while maintaining a lightweight, non-sticky texture. The serum is housed in a specially designed container that helps stabilize the high-content formula by blocking light, heat, oxygen, and external air, ensuring freshness and safety during use.

Benefits

This serum delivers comprehensive skin condition improvement, including moisture replenishment and tone correction. It assists in removing active oxygen to maintain healthy skin, improves irregular skin tone, and addresses signs of skin aging. The formula is designed to be gentle enough for daily use, providing a refreshing moisture and toning care effect without the irritation typically associated with high-concentration vitamin C products.

Main Ingredients and their effects

Ascorbic Acid (13%): Pure Vitamin C that provides powerful antioxidant, brightening, and anti-aging effects by neutralizing free radicals and improving overall skin tone. Super Vitamin E (Tocotrienols) and Tocopherol: These ingredients work in synergy with Vitamin C to create an antioxidant network, strengthening the formula's protective capabilities. Hyaluronic Acid: Known for its excellent moisture-binding properties, it ensures the skin remains hydrated and soothed. Glutathione: An antioxidant that complements the formula to enhance skin clarity and vitality. Niacinamide and Adenosine: These ingredients are included to provide further brightening support and elasticity care.

Clinical test results

In clinical trials conducted on 21 women aged 30–65, COSRX The Vitamin C 13 Serum demonstrated significant results. After a single use, skin moisture levels increased by 113.7%, and skin texture roughness improved by 20.17%. After four weeks of use, visible dark spots and blemishes improved by 16.07%, while hidden spots improved by 12.22%. Additionally, the serum showed improvements in various skin tone concerns: red tones by 31.92%, yellow tones by 15.6%, and dark, dull tones by 3.94%. Further testing confirmed improvements in eye-area wrinkles (10.64%), surface elasticity (19.64%), and deep elasticity (14.07%). Pore-related metrics also saw improvements, including a 36.97% improvement in pore volume and a 34.44% improvement in pore area after one week of use. The formula is dermatologist-tested, hypoallergenic, and suitable for sensitive skin.

Usage instructions

After cleansing and toning, apply an appropriate amount to the face. Attach the provided dropper and shake gently from side to side before use. Apply to the cheekbones and roll from the inside of the face toward the outer edges. Follow with the C-curl lift motion on areas of concern regarding elasticity. If using during the day, it is essential to apply a sunscreen afterward. Due to the high vitamin C content, it is recommended to keep the product standing upright and stored in a refrigerator (3–10°C) before and after opening. Use within 2 months of opening to ensure optimal potency.