Nitric oxide (NO) is a signaling molecule in the cardiovascular system. The precursor of NO in animals is arginine, and its performance has been clearly confirmed. To solve the problem of its costly and can cause amino acid imbalances, NCG (N-carbamylglutamate) is used to increase endogenous arginine production in animals. It helps address issues of intrauterine growth restriction, post-weaning growth lag in piglets, placental nutrient transport, birth weight, intestinal function of newborn animals, growth performance to shorten days to the market. It also promotes capillary development and causes relaxation of vascular smooth muscle. Polyamines can promote protein synthesis, enhance animal immunity, increase milk production, and improve milk quality.