Amino acids also provide protection, boost keratin production and add hydration ... to double cleanse and use a sulphate free ...

We put the best sulfate-free shampoos to the test in 2025 to find the best ones that gently cleanse your hair and help preserve color. Shop ones for all hair types.

Keratin treatments can vary massively in price — depending on your location, the salon itself and offers. In central London, you can expect to pay around £200 for a keratin treatment.