Thayers Double Action Acne Serum for face is the ultimate powerhouse for clearing and healing acne breakouts. This niacinamide serum is packed with a maximum over the counter strength 2% salicylic acid that penetrates deep into your pores, clearing acne in just 1 week. This serum’s turbo-charged trio of 4% niacinamide, 3% lactic acid, & azelaic acid smooths out rough texture, & has been clinically tested to help fade post-acne marks like a pro.