Wasn't thrilled with this for thickening as it seemed to weigh my hair down rather than boost it up, I preferred the volumising shampoo in the blue bottle over this one. Would probably be more effective for drier and thicker hair types.

It's not a bad shampoo but it didn't do anything special for my hair — no noticeable difference from a supermarket brand and thus, not worth paying extra for this.

I am disappointed  with shampoo,what a waste of money! It leaves  my hair greasy and it fells like product is left on the hair. I tried many thickening shampoos, but this one is one of the worse.

I have thinning hair and have tried other products including this. It caused me a lot of dandruff which I also read that one commenter here had mentioned the same thing. Good thing I only bought a small bottle. I also did not check the ingredients before buying and have found that it has sodium laurate which I’m trying to avoid

Nothing, and I mean nothing has ever helped with the (thin) hair volume on top of my oily head. I had zero hopes yet my jaw dropped upon first use. I'm telling you, it's some kind of sorcery. What's best, the effect stays for two days. TWO DAYS! After that, my scalp gets oily/dirty, but, hey, the volume is still there. This plus the Ouai Wave Spray is the killer combo I've been looking for my long thin hair for the last fifteen years. I am simply in awe! Never before have I heard or seen this brand. I bought the shampoo purely because of the rave reviews, so thanks so much to everyone who took the time to leave a review. It's great they offer three sizes. I started with the travel size which was actually larger than I expected. Just 20 ml less than my previously usual La Roche Posay. The travel size lasted for almost a whole month, and I wash my hair three times a week (double shampoo each time). The medium bottle lasts for around two to three months. I'm on my third medium bottle, and I'm so happy to say that effect hasn't faded off, that the shampoo hasn't stopped working like it happens with so many products if I use them continuously. I'm super stoked they brought out a jumbo version! Bravo, Sachajuan! Bravo!