I have very fine hair and didn't feel it did much for my hair. It smells like an old lady's cosmetic (big turn off) for me. So I ended up returning the product. If you are in sephora maybe see if you can snag a sample packet to try before you actually buy it.

This active ingredients stop working after 20 minutes. I have used it as a leave-in, but it wasn't intended for that.

I have been growing out my hair for three years now and with all the damage from coloring and heat styling, it has taken some time. I saw my old hairdresser yesterday (I had moved away and was visiting the area so stopped in to say hi) and she can't get over how long and healthy my hair is. Even when it was short, I had a problem with split ends and dry, damaged hair, and now that my hair is long and I have been using this product, my hair looks amazing. I am finally happy with long hair and I can go six months between trims without getting split ends. I highly recommend this product.

It has definitely made my thinning hair much healthier. It didn't make the lost hair grow back, but several products out there will actually do that. My hair was falling out due to medication, and it is growing back now healthier than ever. Use this on your ends to keep your existing hair healthy, and try Phytocyane Revitalizing Serum for Women - thinning hair, also sold at Sephora. One product not carried by Sephora (not yet - if you are listening, Sephora, please get this line!) is Bosley hair care and they have treatments for thinning hair that have also worked wonders in my hair. This product by Sashajuan, though, will make the hair you have much more healthy and manageable, but give that serum by Phyto a try for your roots.

I use it when my hair is wet, just getting out of the shower, before brushing. This is used in addition to my normal in shower conditioner. I do not believe you can over use it. It is an amazing product!