Vitamin B3 also known as Niacin, is an essential vitamin that helps the digestive system and nervous system function properly. It also helps the body turn protein, fat, and carbs into energy. This essential nutrient plays a vital role in the development of chickens. Niacin is essential for the health, growth, and proper bone development of young chicks. Without enough Niacin, chickens can develop a deficiency, which can lead to leg deformities and other health issues.