How long should a 6-year-old child stop taking lysine is mainly related to the specific situation of the patient and the level of lysine in the diet, and should be analyzed on a case-by-case basis, not as a generalization. Lysine is one of the essential amino acids that promote human development, enhance immune function and improve the function of central nervous tissue. However, lysine cannot be synthesized by the body and can only be obtained through food. If a 6-year-old child is tested for lysine deficiency and has clinical signs of lysine deficiency, such as anemia, lethargy, hair loss, weight loss, loss of appetite, growth problems, etc., lysine can be supplemented in moderation, and it is recommended to follow the doctor’s prescription for the specific duration, but usually lysine should be stopped around 6 months and long-term use is not recommended. If a 6-year-old child’s indicators are normal after a period of conditioning, it is recommended to supplement lysine from the daily diet. Some protein-rich foods are rich in lysine, such as meat, eggs, milk, fish, shrimp, beans, black sesame, etc. Some lysine supplementation during the developmental period of young children is good for their health. In addition, if you are a patient with gastrointestinal diseases, you should avoid fasting when taking lysine to avoid acid reflux, acid reflux, heartburn, nausea and vomiting.