Not sure if that's true. I've been using Kerastase for over 10 years now and this is the only shampoo that works well for my fine, thin and weakened hair. However, this time with this bottle, my head is itchy and I've developed hives on my chest where my hair can touch when I shower and right after. The red spots look like small pimples and do not go away even with cortisone. I stopped using shampoo for 3 weeks and my rash was gone but my hair couldn't take the cheaper shampoo. I love Kerastase, just wish I had to go to a high end salon to get it for a 1/4 bottle size for a ridiculous price than what you see here on Revain. I highly recommend the shampoo but I would settle for a salon buy boooooooo.
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