Niacinamide 5% Face and Body Emulsion, 3.4 oz / 100 ml. The Salicylic Acid 0.5% Body Serum from The Ordinary is designed to treat acne and allow skin to heal. 2 Piece Set includes: 2 x Salicylic Acid 0.5% Body Serum, Full Size 8.1 oz / 240 ml.