Sulphate in shampoos create a rich lather and help remove dirt and oil from hair. However, these products include Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES), as common ingredients. SLS is particularly harsh, while SLES is milder but may still irritate sensitive scalps. 

Both can contribute to colour fading in dyed hair. While effective cleansers, SLS and SLES can strip natural oils from the hair and scalp, potentially causing irritation, dryness, and frizz. Sulphate-free alternatives use milder cleansing agents that clean without over-stripping oils. They're especially beneficial for colour-treated, dry, sensitive, curly, or frequently washed hair. 

These shampoos help maintain colour vibrancy, reduce scalp irritation, preserve natural oils that define curls, and prevent over-drying. Although they may not lather as much, sulphate-free shampoos provide a balanced clean, supporting overall hair and scalp health. This is particularly valuable for those with sensitised scalps due to frequent styling, colouring, and heat treatments.