This review is for the original formula leave-in, in the purple bottle. My hair is in pretty decent shape to start with. I don't color or chemically treat it in any way, but I do shampoo and blow dry every day. This product does a good job of detangling and protecting my hair from heat styling. My hair is fine and has thinned some with age. This product seems to thicken it a little bit. I have used the lite version as well, and I like that it doesn't weigh my hair down. But I prefer the original version, as I feel like it gives me a little bit more "oomph". I spray three squirts into my palm, rub my hands together, and then spread it through my hair. A little goes a long way with this method. Even though it is a bit pricey, I will definitely buy more when I run out.