Peter Blottman Photography/Getty Images This post originally appeared in the Business Insider Today newsletter. You can sign up for Business Insider's daily newsletter here. Problems aren't a problem when you're an influencer selling a supplement. They're profit. The wellness industry loves a good ailment it can heal. These days, public enemy No. 1 is cortisol. From middle-of-the-night wake-ups to extra-puffy faces, cortisol is causing you plenty of issues. At least, that's according to social