Lierac Sebologie Double Concentrate 30 ml is a powerful dual-action treatment for oily and blemish-prone skin that balances sebum production and reduces imperfections. The day serum contains zinc gluconate to regulate oil and mattify the skin, while the night serum features salicylic acid and exfoliating actives to unclog pores and refine texture. Regular use helps achieve a clearer, more even, and visibly healthier complexion.