First of all, I definitely feel the product doing something upon application. There is a slight tingling/warming sensation that lingers. I'll have to update the review after a period of use to confirm efficacy. It does have a perfume smell I'm not fond of, but not a big issue.My issue is, the directions are lacking and leave me with more questions then answers. Directions say apply 1x a day, massage in, and leave on. Okay. And? How much? Full dropper or a couple drops? Am I using this forever or is there a time period I should use it for? Will the results subside after discontinuing? Can it be used in combination with other hair growth products?Hopefully they start putting in an insert with much needed information. I'm still giving 4 stars for now, as the lingering sensation on my scalp suggests it's doing its job. I'll update soon.Update: I've seen a dramatic difference in hair loss. Even the hair in the bottom of shower is so much less. Super happy with product. I'm just going to assume it's a continued use and keep up with it. Highly recommend!