Inoculation of gammaglobulin and BCG polysaccharide nucleic acid can play a role in enhancing immunity. If you want to enhance immunity, in addition to the injection, you should pay attention to adhere to physical activity in general, develop good eating habits, avoid overeating and mono-diet, should be balanced nutrition, and eat more food rich in protein, vitamins, calcium, iron and zinc. Attention should be paid to the consumption of fresh vegetables and fruits, such as kiwi, bananas, apples, yams, carrots, deep-sea fish, meat, eggs, as well as milk, animal liver, etc., to avoid picky eating. Attention should also be paid to maintaining good sleep habits, you can improve your immunity in time. If the body’s immunity is too low, many diseases will appear, and attention should be paid to improve the body’s resistance in a timely manner.