Didn't do anything.
There are better vitamin C serums out there for the price (like Timeless for instance). Don't buy. The packaging is poor as the product leaks every time I close the bottle. The smell is horrendous as well. In terms of its effectiveness - not sure, did not really see the results (used for over a month and a half 2-3 times a week). I ended up throwing it away because I realized I do not enjoy using it (due to smell and the fact that it leaks every time I open it).
Rating: 1 stars