The latest celebrity craze: The vitamin drip used by Rihanna and Simon Cowell

A new A-Lister-led craze lead by Rihanna and Simon Cowell is sweeping the US with more and more people heading to private clinics and getting hooked up to vitamin feeds for an energy-boost.

Clinics have seen an increase in demand after pop star Rihanna tweeted a picture of herself last month with her arm hooked up to an intravenous drip.

Daybreaks Louisa James reports.