Not yet investigated
What we have so far
Oral bioavailability in the low single figures, which is why the phospholipid complexes exist and why two milk thistle products are not the same drug.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.