Tryptophan is a powdery solid product obtained from liquid glucose as a raw material through microbial fermentation and extraction. Tryptophan is a neutral aromatic amino acid that cannot be synthesized naturally in the body. It can regulate protein synthesis, regulate immune and digestive functions, improve protein utilization, and regulate livestock and poultry production performance, feed intake, and feed conversion rate. Increase the proportion of lean meat in livestock and poultry. As a feed additive, it is widely used in compound feed and piglet feed.