first i love how it's smell like fresh orange ! i like it but after i use it it's feel sticky on my face i don't know why
i like this serum a lot, it works better than the Klair's one!
I've been using this for more than a month now, and I did notice a bit of lightening. Maybe if I will continue it, (or if I try the C.21 one?) I'd see more visible results. I was afraid it'd be harsh on my skin, but other than some heat, I didn't feel any stinging at all.