Cosrx The Vitamin C 13 Serum 20 ml

COSRX The Vitamin C 13 Serum 20 ml is a lightweight, beginner-friendly Korean vitamin C serum that restores radiance to dull, uneven, or post-acne-marked skin. It combines 13% Pure L-Ascorbic Acid with 3-O-Ethyl Ascorbic Acid in a Dual Vitamin C System, alongside antioxidant-rich Vitamin E (Tocopherol & Tocotrienols), Glutathione, Sodium Hyaluronate, Panthenol, and Allantoin to brighten skin while keeping it hydrated and comfortable.

Unlike heavier oil-based vitamin C formulas, this water-based serum absorbs quickly without feeling sticky, making it suitable for everyday morning and evening use. Whether your goal is fading dark spots, improving uneven skin tone, or adding radiance to tired-looking skin, its moderate 13% concentration offers an easier introduction than higher-strength (e.g., 23%) vitamin C formulas.

Key Benefits

•           Brightens dull skin – restores natural radiance for a healthier-looking complexion

•           Fades dark spots – 13% Pure Vitamin C improves post-acne pigmentation and uneven tone

•           Antioxidant protection – neutralizes free radicals from UV exposure and pollution

•           Improves texture and clarity – smooths rough-looking skin for a refined complexion

•           Hydrates while brightening – Sodium Hyaluronate, Panthenol, and Squalane prevent dryness

•           Beginner-friendly formula – moderate concentration, lightweight, non-sticky, fast-absorbing

•           Supports early anti-aging care – helps reduce fine lines from environmental stress

Key Ingredients

13% Pure L-Ascorbic Acid, the most researched form of Vitamin C, brightens dull skin, improves dark spots and post-acne marks, supports collagen production, and protects against environmental free radicals. 3-O-Ethyl Ascorbic Acid, a stable Vitamin C derivative, complements it for additional antioxidant support. Glutathione, Tocotrienols, and Tocopherol (Vitamin E) further defend against environmental stress.

Sodium Hyaluronate attracts and retains moisture, while Panthenol and Allantoin soothe skin and support the barrier. Squalane, Niacinamide, Acetyl Glucosamine (NAG), Licorice Root Extract, Caffeine, and Adenosine round out this hydrating, brightening formula.

Note: Ingredient lists may be updated by the manufacturer — always check packaging for current INCI details.

Product Specifications

Skin Type Suitability

Suits normal, combination, and oily skin thanks to its lightweight, water-based, non-greasy formula, while hydrating ingredients help dry and dull skin replenish moisture while brightening. Its moderate 13% concentration makes it a solid choice for Vitamin C beginners. Those with very sensitive skin, a compromised barrier, or using prescription actives should introduce it gradually; discontinue and consult a professional if irritation persists.

How To Use

After cleansing and toner, apply 2–3 drops and pat gently over the face and neck until absorbed, then follow with moisturizer and, in the morning, broad-spectrum sunscreen (SPF 30+). Beginners should start 2–3 mornings/week, increasing gradually; regular users can apply once daily. Refrigerate after opening and use within 2 months.

Authenticity

COSRX is a globally respected Korean skincare brand known for evidence-based formulations over exaggerated claims. To ensure authenticity, buy from an authorized retailer specializing in genuine Korean skincare, and check for the official COSRX logo, batch number, and expiry date.

Frequently Asked Questions

1. What is this serum for? A Korean Vitamin C serum with 13% Pure L-Ascorbic Acid, 3-O-Ethyl Ascorbic Acid, and antioxidants that brightens dull skin, fades dark spots and post-acne marks, and evens skin tone.

2. Is it suitable for beginners? Yes — compared with 23% Vitamin C formulas, the 13% concentration is gentler; start 2–3 mornings/week and increase gradually.

3. Can it help fade dark spots and acne marks? Yes — Vitamin C, Glutathione, Niacinamide, and Licorice Root Extract together improve dark spots and uneven tone with consistent use and daily sunscreen.

4. Morning or night? Both work; many prefer morning for antioxidant protection, always followed by SPF 30+ if used during the day.

5. Does Vitamin C cause purging? No — irritation is more likely temporary sensitivity; reduce frequency and reintroduce gradually if this occurs.

6. Why refrigerate it? Pure L-Ascorbic Acid is sensitive to heat, light, and air; refrigerating at 3–10°C after opening helps slow oxidation and preserve effectiveness.

7. How do I know if it’s oxidized? A light pale-yellow color is normal; dark orange or brown indicates significant oxidation and reduced effectiveness.

8. Can I use it with Niacinamide, Retinol, or Azelaic Acid? Yes — it pairs well with these; introduce AHA/BHA gradually, and use copper peptide products at a different time of day than pure Vitamin C.

Ready for Brighter, More Even Skin?

Fade dark spots and restore radiance with COSRX The Vitamin C 13 Serum 20 ml — a beginner-friendly Dual Vitamin C formula that hydrates while it brightens. Shop from a trusted retailer today for genuine COSRX quality and a smoother, more even-looking complexion.