Autistic children can take lysine Vitamin B12, but it has no therapeutic effect on autism, which can be treated mainly through education and training. Lysine Vitamin B12 is mainly used to treat stunted growth or loss of appetite caused by too little lysine. The adverse effects of the drug are not clear, and the contraindications for special populations such as the elderly, pregnant women and children are not clear. But for the drug allergy is prohibited to take the drug, in addition to phenobarbital, paracetamol and other anticonvulsants can affect the absorption of vitamin B12, so the drug can be used under the guidance of the doctor to autistic children. However, the drug has no therapeutic effect on autism, and it is best for autistic people to receive appropriate education and training with the help of their loved ones, which is the most effective method at present.