USANA Health Sciences Inc. (USNA) develops and markets high-quality, science-based nutritional and personal care products that are distributed internationally through a network marketing system - a type of direct selling. The Company sells to two type of customers - ‘Associates’ and ‘Preferred Customers’. The former buy the product for personal use while doubling up as independent distributors. The latter involve users only without permission to distribute. USNA makes world-class health supplements to enhance well-being, performance, and to aid in protection from diseases. Its customers include professional athletes.