My feeling is that most of the stuff is rumored to help hair growth, not really empirically proven to help. While it sounds like it packs a whallop, no one has used any single ingredient and posted in the success stories. What I mean is, no one has said Caffeine helped them, or topical MSM, etc. When you start seeing people say- I used Revita for 6 months to a year, and look how much better my hair is, after a horrid shed, then it might be worth a second look. I used it for 6-8 months, and my hair looks thinner, not thicker. Usually, once someone has a drastic shed on minoxidil, they get some regrowth, but no one is saying that, as of yet.