The answer, for many supermarket shampoos, is the inclusion of chemical foaming agents like sodium lauryl sulfate and sodium laureth sulfate. Known commonly as sulfates, these ingredients help ...

But derivatives of the sulfuric-acid-based salts, like sodium lauryl sulfate, can still be found in many popular shampoos. That’s because, despite what has been said about how they can harm our ...

What’s the deal with sulphate-free shampoos and do you really need ... The most common sulphates are sodium lauryl sulfate – often labelled SLS – and sodium laureth ether sulfate (SLES).