Amino acid oral solution can be used for people with low immunity because it has the effect of comprehensive regulation of body functions and strengthening immunity. It can be used for those who are recovering from illnesses for the first time, because it can improve protein deficiency caused by various diseases; it can be used for organism failure caused by serious illnesses; it can also be used for those with liver insufficiency, which can have the effect of liver protection; it can be used for patients with kidney insufficiency; it can be used for patients with ulcers, trauma, burns, fractures and post-operative wound healing; it can be used for nutritional disorders in pregnant women and mothers and nutritional deficiency in children; in addition It can also be used to improve the viability of sperm and to improve male infertility.