Ever since I tried Philosophy's On A Clear Day Oil-Free All Over Acne Treatment I have been hooked on it! All you need is a small drop (after cleansing) in the morning and night to help get rid of acne and help prevent breakouts. I have had really bad skin lately and this product (along with the rest of the On A Clear Day line) has helped me clear up my acne troubles and not have bad humiliating breakouts. The product is lightweight, has a tolerent smell, and as soon as you put it on you can feel and see a difference once your face absorbs it in (it only takes like 30 seconds to do so). I wouldn't recommend using it alone if putting make-up on, I would follow it up with a moisturizer (I use the on a clear day oil-free moisturizer, and am in love with it!), and then wait a minute or two to let your face absorb the products so your make-up will go on smoothly. If you have blemishes that won't go away don't forget to use a spot treatment before putting on the moisturizer, but after the all-over treatment.