I've had this sitting in my shelve and initially didn't find it to be super effective at reducing my oil production. But recently, I returned to use it and find that it helps in improving my complexion and now I have clear skin and not much blemishes or bumps. Whilst it doesn't reduce oil or totally remove my blackhead, my overall complexion has improved with consistent usage. I might be using harsh face wash but this serum moisturizes my skin enough that I do not have any dry patches under makeup. Overall, product is great and i'll definitely re-order again to enjoy this good complexion.