A transfer factor is a chemical that is taken from a human or animal that has already developed protection (immunity) against a certain disease. So far, transfer factors for various diseases have been produced only in laboratories for experimental use. Researchers claim that transfer factors can pass along immunity to people who need it. Transfer factors are given as shots or taken by mouth.
Transfer factors are most commonly used for infections, often in people with weak immune systems. Transfer factors are also used for other conditions including various cancers, Crohn disease, chronic fatigue syndrome (CFS), and other conditions, but there is no good scientific evidence to support any of these uses.
