As a registered dietitian who worked in clinical settings for a decade, Josie Porter has seen supplements go from a treatment for deficiencies to a wellness product taken in the pursuit of self-optimization. "I've seen the stacks of supplements getting longer over time. So I can definitely see how the supplement industry is becoming more and more profitable, and more and more popular," Porter, the author of "How Not To Take Supplements," she told Business Insider. Although supplement ads can be