Just finished a bottle of this and I love the results. It truly decongested and retexturised my oily, acne-prone skin. My skin is way less oilier than it used to be, and the longer I used it, the better the results. The serum is supposed to tingle and but you only really need one pump for the whole face and neck (lasted 7.5 months used every night). But you gotta wear a moisturiser over this serum because it is NOT meant to be used on it\’s own. I love that this serum has no fragrance and that Drunk Elephant is a clean brand. My skin is now so smooth, evenly toned, and bright when I look up close in the mirror, so I highly recommend to anyone who wants results with minimum effort. Worth the $$.