Thymidine is a heterologous substance, mostly calf thymus extract at present, which may cause adverse reactions such as allergy, dizziness and respiratory difficulties. Gammaglobulin is a blood product, and although it has undergone strict screening, the possibility of contaminated blood cannot be 100% completely excluded. Interferon, when used, may cause erythema and pressure pain at the injection site, as well as generalized chills and fever and other discomfort. Therefore, when using the above drugs, the corresponding indications must be strictly observed and should never be used indiscriminately. For the general public, the “ability” to boost immunity with immune boosters is limited, cost-effective, and potentially risky, and can do more harm than good.