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Definitely does volumise your hair, I was extremely surprised how big your hair actually gets. Only downside, I feel like I need to clean my more than twice a week which is more than when I used to use the orange top Kerastase shampoo.
I'm not able to say if it gives volume or not, because I also use other products for volume and lift, but it's a good shampoo. I will probably try to use it once without all the other products to see if it helps with volume. Overall, I'm happy with it.