People enter the Herbalife Ltd. Los Angeles distribution center in Carson, California, U.S.

Nearly 600 independent distributors of the diet and nutrition sales brand Herbalife were disciplined last year for making medical claims when selling the company's weight-loss shakes and supplements, despite company policies to prevent such tactics, ABC News reported.

The internal numbers were revealed by Herbalife after an ABC News undercover investigation found numerous examples of distributors boasting to potential customers that the company's products helped treat maladies ranging from diabetes to heart disease.