Sorry, but doctors are some of the most ignorant and misinformed people on the planet when it comes to OTC supps. Most of the blame is due to the large pharmaceutical companies who stand to lose billions if they cannot downplay the therapeutic benefit of OTC supps.
All the lab tests showing beneficial results of milk thistle extract (silimaryn) were done with the powder or extract. And current studies indicate you can hardly get adequate therapeutic effects from drinking green tea. Extract is far more condensed and works better. You need to download a copy of the audio-tape or CD "Dead Doctors Don't Lie!"