To drink! I saw a billboard for this in Penang. It's considered an anti-oxidant.
Coincidentally, I came across this article "Wheatgrass Juice and Folk Medicine" in the August 2008 Scientific American by Michael Sherman:
The recent medical controversy over whether vaccinations cause autism reveals a habit of human cognition – thinking anecdotally comes naturally, whereas thinking scientifically does not. ... On the other side are parents who noticed that shortly after having their children vaccinated autistic symptoms begin to appear. These anecdotal associations are so powerful that they cause people to ignore contrary evidence ...
Take wheatgrass juice ... if you can stomach it. The claims for its curative powers are bottomless.
While we're at this here are some other personal examples from my uncle who swears by the following:
1. Fruit wash when used on the skin can eliminate blemishes and acne.
2. The juices from discarded fruits and vegetable (when left to compost) is a very efficient cleaning agent (even for the skin).