COSRX THE VITAMIN C23.

COSRX The Vitamin C23 Serum is a high‑strength antioxidant serum from the Korean skincare brand COSRX, formulated with 23% pure vitamin C (ascorbic acid). It’s designed to brighten dull skin, even out tone, fade hyperpigmentation or dark spots, and support firmer, more radiant skin overall.

Key Ingredients & Their Benefits

• Vitamin C (23% Ascorbic Acid): A potent antioxidant that helps reduce dark spots, even out skin tone, encourage collagen production, and fight free‑radical damage from sun and environmental stress.

• Vitamin E (tocotrienols/tocopherol or “Super Vitamin E”): Supports the antioxidant action of vitamin C, helps stabilize it, and adds extra protection against oxidative stress, which can help slow down early signs of aging.

• Sodium Hyaluronate (Hyaluronic Acid): A humectant which helps draw moisture into the skin, keeping it hydrated and plumped — useful especially when using potent actives like high‑dose vitamin C that might lean drying for some skin types.

• Soothing & supporting components (e.g. Panthenol, Allantoin, various botanical extracts): These help calm potential irritation, support skin barrier health, and add skin‑conditioning benefits to balance the potency of vitamin C.

Product Features & What It Does

• Brightens and evens skin tone: High‑concentration vitamin C targets pigmentation, dark marks, and dullness — helping restore radiance and a more uniform complexion.

• Fades hyperpigmentation & dark spots: With regular use, the serum helps reduce appearance of post‑acne marks, sun‑induced spots, or discoloration.

• Improves skin texture & firmness: By promoting collagen production and supporting skin’s antioxidant defenses, it can help reduce early signs of aging — fine lines, uneven texture, dullness — and leave skin looking healthier.

• Hydration and plumping support: Thanks to hyaluronic acid and the serum’s moisturizing base, skin stays hydrated and feels more supple, helping reduce dryness or tightness often caused by active treatments.

• Antioxidant protection: Vitamin C + E + other antioxidants help defend skin from oxidative stress caused by UV exposure, pollution, or lifestyle — potentially helping prevent premature aging.

How to Use

• After cleansing (and optionally toning), shake the serum bottle gently (to mix any separated layers) before use.

• Apply a few drops to clean, dry skin (face and neck), then gently massage or pat until absorbed.

• Follow with moisturizer; if using during the day — always use sunscreen after, to protect skin as vitamin C can make skin more sensitive to sun.

• For best potency and stability: store the serum refrigerated (3–10 °C) once opened and aim to use it within about 2 months.