the serum significantly assisted with the reparation of my skin. after about two weeks of using it, the redness on my cheeks reduced greatly, and the appearance of acne begun to depreciate. it does get sticky if you apply to much; 3 drops is usually enough to cover my entire face. i used it simultaneously with cosrx's bha blackhead power liquid (bha in the evenings, vitamin c in the mornings) and ultimate moisturising honey overnight mask, and my skin had never felt so smooth/look so bright and healthy! i highly recommend this product.