Herbalife Ltd. (NYSE:HLF) has appointed former US Under Secretary of State Maria Otero to its board of directors, the company announced in a statement. Otero has also served in the UN Advisors Group and on the board of multiple humanitarian organizations, and strengthening the company’s image is probably a big part of why she was asked to get involved. “For more than 30 years, I have focused on helping individuals empower themselves through work, so they can take control of their own lives. I have seen first-hand the power of giving those individuals and entire communities the chance to realize…