There is some information on sensiblehealth.com, also you can talk to chinese herbalist.
I am currently using GCG as herbal tea, I would say my digestion is twice as good now. I feel very energized, like a tank – start my engine and just go and don’t want to slow down until it’s time to sleep.
However I could not get the tincture, so I have to take dry grass and boil it with water.
I also want to hear about someone else experience.