It depends on your choice. Green drink powder has become famous and has gained acceptance among the public. But people are certainly over looking its long term health effects. As most of the green drink powders are made from raw green vegetables, fruits and grass. They contain highly potent vitamins and minerals which may be detrimental to health in the long run. For instance, most of the green drinks are made from avocado, cucumber, broccoli sprouts, spinach, lime, parsely, cabbage, collard greens, okra, lemon grass, wheat grass, barley grass, oat grass, couch grass, and the list goes on. These ingredients are minimally processed to retain its nutrients and color. So, the powder remains green. Animals eat grass and with the help of green drink powder, now humans also eat grass in powdered form.
These green powders may not be detrimental to health immediately, but intake of too much of power packed nutrients to human body on daily basis would have its own effect on cellular growth and body's metabolism.
For instance, a bowl of half boiled cabbage has the potential to increase blood clotting. Similarly a bowl of half-cooked spinach can boost the folic acid and iron level of the body, and thereby produce new red blood cells. So, when cooked foods produce so much of effect on blood cell count and cellular growth, imagine how much effect the vegetables and grass would have in its raw form on human body. There hasn't been any detailed study done on this. You can't go by the fact that structure of human blood cells is similar to chlorophyll that are found in plants.
