COSRX Pure Vitamin C 13% Serum (Renewal) is a Korean skincare formula that combines 13% pure vitamin C with vitamin E and hyaluronic acid. This facial serum is designed to address uneven skin tone and dullness by supporting the skin's natural brightening process. Vitamin C is known for its antioxidant properties, which help protect the skin from environmental stressors, while vitamin E works alongside it to reinforce the skin barrier. Hyaluronic acid provides hydration to maintain a plump and smooth texture.

The serum has a lightweight, water-based consistency that absorbs quickly without leaving a sticky residue. It is suitable for those looking to target hyperpigmentation, lackluster complexion, or general signs of fatigue in the skin. The formula is deliberately simple, aiming to deliver high concentration of active ingredients while minimizing potential irritation.

This product is intended for topical application on cleansed skin, preferably in the morning as part of a daily skincare routine. It should be followed by a moisturizer and sunscreen for optimal protection. The serum comes in a 0.67 oz (20 ml) airless pump bottle to preserve the stability of the vitamin C.

As a renewal version, this serum may offer improved stability and efficacy compared to earlier formulations. It is recommended to patch test before full use, especially for those with sensitive skin. The product is vegan-friendly, cruelty-free, and free from parabens, sulfates, and phthalates. It is not tested on animals. This serum is appropriate for normal, combination, oily, and dry skin types, though those with very reactive skin may wish to start with a lower frequency of use. The packaging is designed to minimize light and air exposure, helping to maintain the potency of the active ingredients over time.