Sulphates are the detergents that make shampoo foam heavily and clean thoroughly. Sulphate-free formulas use milder alternatives — less foam, gentler cleansing.

Gentler is not the same as better. It depends entirely on your hair.

Who genuinely benefits

  • Coloured hair. Milder cleansing means colour holds longer. This is the strongest case
  • Curly and coily hair, which is drier by structure and tolerates stripping badly
  • Dry or damaged hair
  • Sensitive scalps, where strong detergents cause irritation
  • Anyone washing daily, where a gentler formula is less cumulatively harsh

Who does not need it

  • Oily hair and scalps, which often need the cleaning power
  • Anyone using silicone-heavy styling products. Mild cleansers may not remove them, and build-up accumulates
  • Fine hair that goes flat easily — the gentler formulas can leave more behind

The transition nobody mentions

Switching produces an awkward two to three weeks. Hair often feels heavier, less "squeaky", sometimes greasier. That is not the shampoo failing — it is the absence of the stripping you were used to, plus any residue from previous products.

Most people who abandon sulphate-free do so in week two. Give it a month before judging.

Practical adjustments

  • Use more product and lather twice. Less foam is not less clean, but it needs a second pass on the scalp
  • Massage longer — a good minute at the scalp
  • Rinse thoroughly
  • Add a clarifying wash monthly if you use styling products, to clear build-up

The marketing claim to ignore

"Sulphate-free" is not a safety statement. Sulphates are not harmful to skin or hair in the concentrations used in shampoo — they are simply effective detergents that can be drying with frequent use.

The reason to choose sulphate-free is gentleness for hair that needs it, not avoidance of something dangerous.

The honest summary

If your hair is coloured, curly, dry or your scalp is reactive, it is worth switching and worth persisting through the transition. If your hair is oily and straight and you are happy with it, there is no reason to change.

For the range of formulas, see the shampoo guide.