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I love this shampoo but I gave it 3 stars because just recently I tried the Vichy Aminexil Shampoo and that really has made a difference . So I will be interchanging between both products . Kerastase is really great for strengthening hair strands but Vichy is amazing for strengthening the scalp and reducing hair fallout but it's too early to tell if it stimulates hair growth. So Kerastase is good but for now I feel Vichy is the more superior product .