The effects of Salicylic Acid are beyond description. Salicylic Acid takes some time to absorb and act on the skin, so it does not show immediate effect. But once it's absorbed into the skin, it's more powerful! It not only solves our annoying acne problems, but it also has antibacterial effects to prevent pimples in advance. It also removes skin irritation that prevents skin circulation and has a moisturizing effect. This helps to drive Blackhead out of your skin! On the other hand, Salicylic Acid, which shows its efficacy when using it consistently, can cause side effects on the skin if you use this ingredient incorrectly. Cos De BAHA wants to introduce the S4 Serum at a safe rate so that everyone can enjoy the effects of Salicylic Acid safely. Now, take care of your blocked pores with S4 Serum and make your skin much healthier.