As a child, I distinctly remember the Proactiv commercials of the early 2000s. Each 30-second slot was star-studded with the young Hollywood starlets of the time, like Jessica Simpson and Alicia Keys.

We've all seen those adverts, where Jessica Simpson talks about how she once had bad skin (yeah right!), but started using Proactiv and now she has the skin of an angel. I am always sceptical ...