For many men and women, shampoo is not something that they spend a lot of money on – they find a brand that they think works and is affordable and they use it their whole lives. Deciding how much you should spend on shampoo is not easy – how do you know that paying more will provide any additional benefits than you’d get from a cheaper brand? To answer this question, some scientists recently conducted experiments. They washed hair with cheap, commonplace brands and also with more expensive ones and…

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