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Sulfate-free shampoos are hair cleansing products that do not contain sulfates, which are harsh cleansing agents that can strip the hair of its natural oils. These shampoos are formulated with alternative surfactants that are gentler on the scalp and hair, making them suitable for those with sensitive skin or dry, damaged hair. Sulfate-free shampoos are known for their ability to clean the hair without causing irritation or over-drying, leaving the hair feeling soft, smooth, and healthy.