In general, except for patients who are allergic to transfer factor, there are no cases where it is not recommended to take transfer factor if the patient is symptomatic. Patients are advised to use it under medical supervision to avoid adverse reactions caused by taking transfer factor for too long or using too much of it. Transfer Factor is an immunomodulatory drug that is commonly used to treat viral and mycotic intracellular infections such as herpes zoster, epidemic B encephalitis, vulvovaginal pseudomycosis, and viral myocarditis. It is also useful for immunodeficiency diseases, such as eczema and thrombocytopenia. In addition, transfer factor is also useful as an adjuvant treatment for malignant tumors, such as lung cancer, nasopharyngeal carcinoma and breast cancer. Patients need to take transfer factor under the guidance of doctors. If patients take too much transfer factor, they may develop drug toxicity and long-term use may cause immune dysfunction, such as the development of rheumatoid arthritis and systemic lupus erythematosus. Transfer factor is an acidic drug, and if taken for a long time it may also stimulate the gastrointestinal tract, causing damage to the gastric mucosa, acid reflux, nausea, abdominal pain and abdominal distension.