Toxic solvents like decane, hexane, carbon tetrachloride and benzene will get more flavor or fat or cholesterol out of things than metabolizable grain alcohol. Of course, the extraction process calls for washing out the solvent later. But it can't all be washed out, and a detailed analysis on the final product would give the public the information they need to make informed choices. All supplements must be tested for purity by yourself. If this cannot be done, don't take them.
Polluted supplements do much more harm than good.
Get your super-nutrition by juicing vegetables of all kinds and making herbal teas. Safe Supplements There are, no doubt, lots of safe supplements to be had. The problem is knowing which they are. The nature of pollution is such that one bottle might be safe, while another of the same brand is not. In view of this, as I found a polluted bottle, I stopped using any more of that brand.