​Cos De BAHA Salicylic Acid BHA 4% Serum (S4) is a powerful yet gentle solution for oily and acne-prone skin. This 30ml serum combines 4% salicylic acid with niacinamide to effectively exfoliate pores, reduce blackheads, and prevent future breakouts. Its alcohol-free formula includes soothing ingredients like aloe vera and green tea extract, which help calm irritation and redness. Regular use can improve skin texture, minimize pores, and brighten the complexion. Ideal for those seeking a reliable acne treatment without harsh chemicals. Suitable for daily nighttime application after cleansing and toning. For optimal results, follow with a moisturizer and apply sunscreen during the day. This serum is made in South Korea and is free from parabens, sulfates, and artificial fragrances. Experience clearer, smoother skin with Cos De BAHA S4 Serum.