slight improvement noticed

I bought this I little over a year ago. I used it once a day (2-3 drops). There was an improvement initially but it has lost its effectiveness. I will finish up the bottle but probably will not buy it again.

The price is a bit on the expensive side. The solution is like serum and is slippery. I have been using it for a few weeks now, but I don't notice a difference in the lightening of my dark spots. However, I notice my overall face has been more hydrated during the day.