Coffee although some studies have shown that it has health benefits, you have to remember that it also has dehydrating effects as well. It pulls water out of your system.
Hence dry dehydrated skin can be made worse with too much coffee.
In regards to taking anti-oxidents internally, if you do not have a functioning digestive system, you can take whatever you want but you won't receive the health benefits if your digestive system is not functioning properly.
I would reccomend a cleanse first or at the least pro-biotics (NOT THE YOGURT ACTIVA!! OR SIMILAR) prior to taking the antioxidents.
Personally I like greens I mix it with my protein shake in the AM fills me with energy!
Skyhaven: what i do with blueberries is wait till they are in season, then hit the farms markets. EXTREMLY CHEAP! and then i freeze them for use throught the winter!