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What is this supposed to do, anyway?

I've purchased Kerastase hair products before and am not afraid to spend money for good products. I've used this sample every day since receiving it and I honestly don't think it does anything. I've followed both sets of instructions: to either use before shampooing or after as a leave-in treatment. It smells nice, but other than that I don't think it has actually done anything. I wouldn't pay for something that doesn't seem effective. Nice size sample though.

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