La Roche-Posay Effaclar Serum 30ml is a lightweight acne treatment formulated with a Triple Acid Complex of salicylic acid, glycolic acid and LHA to clear blemishes, reduce post-acne marks and refine skin texture. Enriched with niacinamide and thermal water, it soothes irritation while minimizing pores, fine lines and excess sebum. Best for oily, acne-prone skin, apply nightly and pair with daily SPF for optimal results.