Hi Marley, yes I too tried their serum after reading about it online. I think I've been using it for about 3 weeks. But instead for just skin whitening I'm using it as a generic after wash serum. So far it's been pretty effective for me. The serum is really comfortable to use on the skin and comes only with a mild fragrance. I haven't been really monitoring my skin but a few buddies of mine have asked why my skin has improved over the weeks...Considering this is the only change to my skincare regime I guess it's working pretty well.