For the milk thistle extract,
if you only have the requirement for silymarin,the one extracted from basic solvent of acetone is ok,
if you have the requirement for silybin,the one extracted from 100% of acetone or 100% of ethanol is qualified.
And the price of the basic solvent acetone is lower than the price of 100% of acetone or 100% of ethanol.
The offer and sample can be supplied for reference.

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