"Lather, rinse, and repeat" may have been your shower mantra for years, but it's not the best protocol to follow if you want healthy hair. Washing regularly with supermarket shampoo, most of which are full of harsh cleansers, can irritate your scalp and strip your hair of the natural oils it needs to be healthy, smooth, and easy to style.

What's wrong with that $3 bottle of supermarket shampoo? Although economical, it's most likely packed with harsh chemicals known as sulfates, which show up on ingredient labels as "sodium lauryl sulfate," "sodium laureth sulfate," and "sodium lauryl esther sulfate." While these detergents help make products sudsy, they also deprive your hair of its healthy oil, leaving it dry, brittle, and difficult to manage. To avoid these effects, look for a low-sulfate or sulfate-free shampoo, which cleans without removing oil.

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