Herbalife is a global nutritional company that sells weight management and skin care products through a multi-level marketing model. In 2012, hedge fund manager Bill Ackman presented a report alleging that Herbalife operates as a pyramid scheme by targeting low-income populations. Ackman took a short position on Herbalife stock. Herbalife denies the pyramid scheme accusations and points to expanded disclosure on its business practices. However, critics argue Herbalife takes advantage of financially insecure communities by relying on unpaid product promotion through secretive training programs.