The 6 products we tested are most likely free from spiked drugs and stimulants and are "clean" in terms of the heavy metal contaminants we tested for. However, the science behind many of their claimed ingredients are questionable. In some cases, the dosing would too low to be appropriately effective. In other cases, specialized forms of ingredients turned out to be simple, and relatively cheap formulations, albeit effective in certain cases. As always, we recommend you consult a licensed health professional when beginning any new supplement regimen and do your research as to what is really inside each product and whether it's right for your health.