I found powders for both of these in 1, 2, 8, and 16 oz containers at www.leavesandroots.com
With 16 oz (900 grams) being around $7-$12 each, it is obviously MUCH cheaper for me to cap my own here but my question is this:
Is a powder "MILK THISTLE seed powder Silybum marianum " the same as the stuff you buy on the shelf as far as potency goes?