I've used this for around three months now and I'm quite impressed with the amount left in the bottle (see photo), I use it 2-3 times a week, sometimes more and at this rate it may last me another 3 months. As it is an AHA it' important to ease into using it, I initially overused it and as a result the AHA felt like it was burning my skin and I destroyed my skin's moisture barrier. But after trying again I feel like it's working better for me though still not as good as the results everyone else is getting so it just may not be suited for my skin.