I use this especially in the morning about 2-3 times a week. I have been using this for a couple of months now. It is a mild exfoliant and I find it makes my skin brighter and somewhat plumper - it doesn't feel so tired and dull anymore. I store it in my fridge and am halfway through the bottle and I noticed a slight oxidation, but it isn't too bad just yet and I think it will last well another couple of months too.