COSRX Pure Sodium Hyaluronic Acid 3% Serum is a lightweight, hydrating formula designed to support moisture retention in dry and dehydrated skin. The product contains 3% sodium hyaluronate, a salt form of hyaluronic acid known for its ability to attract and hold water within the skin’s outer layers. This concentration aims to deliver a noticeable boost in hydration without relying on more viscous or tacky textures.

The serum is intended to help reduce the appearance of fine lines and wrinkles that result from moisture loss, while also supporting the skin's natural barrier function. By replenishing hydration levels, it can assist in maintaining a smoother, more plump skin surface over time. The formulation is free from artificial fragrances, making it suitable for those who prefer unscented skincare or have a heightened sensitivity to added perfumes.

This Korean skincare product is best suited for individuals with dry, normal, or combination skin types looking for a straightforward hydration booster. It can be integrated into both morning and evening routines, applied after cleansing and before heavier moisturizers or oils. The 0.67 fl. oz (20ml) size offers a compact option for travel or for those who wish to trial the formula before committing to a larger bottle.

COSRX focuses on minimalist, effective ingredient profiles, and this serum exemplifies that approach with a simple formula centered on high-purity hyaluronic acid. It does not claim to reverse aging or provide dramatic transformations, but rather to supply consistent, gentle moisture support for daily skincare needs. The product is marketed as part of a routine that emphasizes hydration without irritation.