Review (5/5): Love! Easy, affordable, effective.
This is, I think, my third order of Rio De Keratin. I'm able to get 3-4 treatments out of each kit with my hair ranging from super short to just below my shoulders. I usually still iron my hair, but it stays flat, even in Alabama's subtropical humidity. Otherwise, it doesn't matter what I do: by the time I walk from my house to the car, my hair is frizztastic. But with a keratin treatment, I can even just blow dry my hair and it look fantastic. This saves so much more time and it makes styling last for days. I also hike and get sweaty and my hair still looks great after it dries. Once, after a day of kayaking, I rode in the back of a friend's truck back to the marina, and my hair still looked terrific. This of all things has given me the hair I've dreamed of. And at $10-$15 per treatment, this price is right.
Of course, it does smell terrible. And the fumes can sting your eyes, both as you apply it to your hair and as you iron it out. I like to open the back door and aim a cyclonic fan into the bathroom while I use this stuff so I don't choke on the fumes.