Bulletproof Coffee

Bulletproof Coffee

00:50

It's the latest coffee craze. Check out Gareth giving it a go.

In case you haven't heard, Bulletproof Coffee is the latest world wide coffee trend.

It's used by popstars before they go on stage, world champion athletes and even top executives, to give a boost to brain power.

What do you think - would you try coffee with butter in it?