Your body will certainly let you know if and when you have taken too much Hu-Mana-Tea. You will get EXTREMELY nausated and some will vomit. This is the signal to back down the dose.
The more toxic a person is - the more tea they can tolerate. I have folks all the time get worried because the CAN'T take large amounts anymore. Just Friday a lady was very concerned because she went from 12 ounces per day (for about 5 weeks) and within 5 days had to back down to 3 ounces.