What is the max amount of fresh barley juice I can give my wife per day.

I plan on doing this before each meal. My wife has Breast Cancer in her spine, hip, shoulder, and liver. She is experiencing tumor fever. I have been giving her 4 ounces of fresh Barley grass juice each morning. She just started drinking 4 ounces before each meal, 12 ounces per day. Can we add more juice between meals? How will we know we have reached her limit? We have been told that wheatgrass would be to cleansing but that Barley grass was strengthening. I have not been able to find much information on the web about the benefits of one juice over the other. All references to information specifically regarding direct comparisons of these two juices would be appreciated. We accept full responsibility for the actions we take.
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