What Caffeine Does:
Caffeine, as we all know, is a stimulant. That means it helps quicken a process or functional activity.
Caffeine also has the ability to penetrate hair follicles.
So, since caffeine can zip right into the follicles, it's only logical to conclude that it should also be able to do its stimulating thing to the hair and 'quicken' the growth.
And that's exactly what it seems to be able to do.
Keep an eye out for Mr Beans new shampoo range!