HEAD&SHOULDERS EFFECTIVENESS
![FAQ: WILL HEAD & SHOULDERS LOSE ITS EFFECTIVENESS OVER TIME? FAQ: WILL HEAD & SHOULDERS LOSE ITS EFFECTIVENESS OVER TIME?](https://images.ctfassets.net/r7ye34hekb3l/KWt1_BLIkHWsHTgbsKA2VE/77b98b24b8ecbf7cd2a464ab28730663/image-thumbnail-does-head-and-shoulders-lose-effectiveness-440-970-stage-cFgQA-image.jpg?fm=webp&fl=progressive&q=75)
No, it’s a myth that your hair and scalp build up a tolerance to particular active ingredients in anti-dandruff shampoos.
In 50 years of research we’ve never seen any evidence to suggest that a tolerance to the Zinc Pyrithione (ZPT) in our anti-dandruff shampoos develops.
In fact, Head & Shoulders scientists put this myth to the test in a clinical study that lasted 12 months, spanning all 4 seasons.
Over the course of the study, those people using Head & Shoulders shampoo had less scalp flaking than the group using ordinary shampoo (the ‘placebo’). Moreover, Head & Shoulders performed just as effectively in the final month as it had in the first.
So keep using Head & Shoulders and stay protected against flakes.