COSRX The Vitamin C 13 Serum 20mL

Vitamin C serums are leave-on products used after cleansing and toning to support a brighter, more even-looking complexion. This version contains 13% ascorbic acid, the pure form of vitamin C, and is positioned by COSRX as its more approachable option for people beginning concentrated vitamin C care.

A lower concentration than the 23% version does not mean every skin will tolerate it immediately. Start with a small amount and build a comfortable routine. This formula also includes moisturizing and soothing ingredients, so the experience is not only about brightening. It still requires careful storage and sensible pairing with other active products to keep your routine manageable.

13% pure vitamin C with hydration-focused support

The serum combines a defined ascorbic acid concentration with supporting ingredients selected for moisture, comfort and antioxidant care. Its fine, fluid texture is designed for a few-drop application. Keep the separate first-use cap and dropper arrangement in mind when opening the bottle, and follow the specific cold-storage guidance rather than leaving it on a sunny shelf.

• Ascorbic acid at 13%: Pure vitamin C is the central active ingredient. This is the 13% formula, not the stronger 23% product, so use the correct concentration when choosing your routine and reviewing the supporting product information.
• Antioxidant companions: Tocotrienols, tocopherol and glutathione support the formula alongside vitamin C. These ingredients complement the product’s skin-conditioning focus; their inclusion does not turn the serum into a sunscreen or replace daily UV protection.
• Moisturizing ingredients: Panthenol, sodium hyaluronate and allantoin help balance the concentrated-serum experience with hydration and comfort. They are part of the finished formula rather than separate products you must purchase to activate it.
• 20mL dropper format: The compact bottle allows controlled dosing and a limited after-opening period. Replace the original cap with the supplied dropper at first use, keep the bottle upright and refrigerate as directed.

Brightening care without a heavy serum finish

A consistent routine can help improve the appearance of dullness, uneven tone and skin texture. The watery feel makes this serum a useful option when you want an active step that fits beneath moisturizer. Benefits are gradual and individual; more drops or more frequent use are not a shortcut to better results.

• More even-looking tone: Targets the appearance of dark spots and uneven pigmentation as part of regular skincare, helping a dull complexion look clearer and more radiant rather than providing an instant bleaching effect.
• Early signs of aging care: Helps improve the appearance of fine lines and texture while supporting a supple finish. It is intended for cosmetic care, not the treatment of a medical skin condition.
• Comfortable layering: The lighter texture absorbs without the richer feel of an oil-layer serum, making it easier to follow with moisturizer and a separate sunscreen in a daytime routine.
• A measured introduction: The 13% concentration offers a distinct choice within the COSRX vitamin C range. Patch testing and gradual use help you assess personal tolerance before making it a regular step.

You Get:

• 1 × COSRX The Vitamin C 13 Serum 20mL