Shop Cos De BAHA serums and treatment skincare for targeted concerns such as dark spots, texture, pores, dehydration, and barrier support. This collection is led by active-focused formulas featuring niacinamide, tranexamic acid, retinol, bakuchiol, peptides, hyaluronic acid, ceramide, and vitamin C across serums, toners, and creams. The assortment is especially strong for shoppers building a routine around concentrated leave-on steps rather than a broad wash-and-mask category mix. At Protoclinical, we treat Cos De BAHA as an evidence-led serum wardrobe: choose one or two actives based on your skin concern, support them with hydration, and keep the page focused on tone, texture, and routine precision. Explore the collection to build a clinical-feeling Korean skincare protocol with targeted treatments that fit into consistent daily use.