COSRX 6X Peptide Collagen Skin Booster Toner Serum for Dull Skin, 5.07 oz | Preps Skin with Copper Peptides, GHK-Cu for Uneven Skin Texture, Skin Renewal Boosting Facial Essence, Korean Skin Care

Customers find the toner serum effective at improving skin appearance, making it look refreshed, smooth, and hydrated, with one customer noting it works well with retinol and adapalene. The product receives positive feedback for its moisturizing properties, making skin feel plump and hydrated, and customers appreciate its brightening effects. While some customers report it doesn't irritate sensitive skin, others mention it can cause rashes. The consistency receives mixed reviews, with many noting its watery nature.