USANA has not conducted research regarding the use of USANA products in those who have undergone gastric bypass or similar surgical procedures. However, it is important to understand that this surgery alters gastrointestinal anatomy, causing a significant impact on long-term nutrient and health status. Deficiencies of iron, vitamin B12, folic acid, and calcium can be quite common long term after this surgery.

USANA recommends that those who have undergone gastric bypass or a similar procedure discuss the use of USANA products with their physician and/or other health care providers (e.g. a dietitian who specializes in gastric bypass nutrition).