Review (2/5): Ulta has WAY cheaper, you have to use their brush to active the serum.
I use this product in light. However reasons it may not work for some is you have to use their brush. It actually activates the serum in it. Also this is so over priced. Go to Ulta and they sell if for much cheaper. (34, or something like that) I cannot believe how overpriced this is and reading some of the reviews I'm going to guess it may not be the real thing.