In the movie Avengers: Age of Ultron, the Avengers return to Stark tower after Clint is wounded. Whilst Dr. Cho works on healing Clint, Tony Stark walks in with a tray of five transparent cups containing a green beverage for the group members.
What is that green beverage?
More than likely it's some variation on the classic Superfood smoothie While the benefits of so called "superfoods" are up for debate, their popularity among the nouveau health conscious crowd is without question. Tony is seen drinking liquid chlorophyll to combat palladium poisoning in Iron Man II, my guess is he stuck with it, adding some fillers such as kiwi and apples to make it more palatable.
It looks like chlorophyll, which Tony mentions drinking in Iron Man 2 as a way to counteract the palladium poisoning. Wheatgrass is a bit lighter in color, and chlorella/spirulina would have some graininess. This looks very clear with just a bit of foam from being blended. There'd be no reason for him to blend it unless he added some citrus or sweetener to make it more palatable. It's a good detox, but doesn't offer much in the way of protein/energy for recovery. You can mix a tablespoon of liquid chlorophyll (available at health food stores) with 8 ounces of water, but if you want a true green superfood drink, I'd go with spirulina (which contains all essential amino acids) or a blend like Amazing Grass.
