The wonders of beetroot juice were all over the broadsheet newspapers a few months ago. The jury is still out on how effective it is for cyclists, but for those willing to test it, this 250ml bottle would be a good way to start.
Its 10 percent apple juice makes it more palatable and a half bottle per day is enough to get the publicised benefit. It's also enough to turn everything that you excrete red.
Beet It are also developing a concentrated shot, so beetroot haters can down it in one, with minimal fuss.