Is anyone aware of the halachos regarding the use of supplements? I have seen (though not studied) a few, and it is questioned whether the entire field of supplements and vitamins is even muttar according to halacha. I assume that there is substantial question regarding the effectiveness, with a minimum of reliable scientific study available. I also suspect that there is a basis to question because there is minimal to no quality control, to insure that the package label is accurate. Taking medications (supplements are considered medications, though available without prescription) that are not reliable might present a halacha problem.
If someone can share a reference or two to tshuvos on this, I can review them and speak from something better than very vague memory and assumption.