Parenteral nutrition (PN) is a medical method of delivering essential nutrients including proteins, carbohydrates, fats, vitamins, minerals, and trace elements directly into the bloodstream through an intravenous (IV) catheter. It is used for patients of all ages, from infants to adults, who cannot eat or absorb adequate nutrients through regular or tube feeding. This sterile liquid formula helps maintain proper nutritional status by bypassing the digestive system entirely, ensuring patients receive the vital nutrients they need to support health and recovery.