There is little evidence that "a lot of supplements" are doing more harm than good. That is speculation. If you search pubmed there are thousands of studies lo

There is little evidence that "a lot of supplements" are doing more harm than good. That is speculation. If you search pubmed there are thousands of studies looking at potential benefits. However, if you are going to regulate based on real evidence of harm, then you would do the same for fast foods. There we have substantially more evidence of harm than we currently have with supplements. Or we could decide to live in a free country and stop criminalizing what people decide to put into their bodies of their own free will. We are trending to free access to marijuana, I would find it ironic to then start restricting supplements.