[mochaccino]

If you want some reassurance of potency, you could try a standardized extract. I've never tried milk thistle, but NOW Foods is a pretty trustworthy brand for other things, and there almost always extremely inexpensive. They've always done well by me, so I know I would personally try them out first. Iherb is usually the cheapest place to buy anything from NOW, and there also really trustworthy and cheap. For me this makes much more sense then buying it in a store. Here's a link if anyone's interested: http://www.iherb.com/Now-Foods-Silymarin-Milk-Thistle-Extract-150-mg-120-Vcaps/794