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Transfer Factor
Originally discovered in the 1940s–1950s by immunologist, transfer factors were extracted from white blood cells and are also found in sources like colostrum or egg yolk
Transfer factor refers to small immune messenger molecules, primarily low-molecular-weight proteins or peptides produced by T cells and other lymphoid cells in the immune system.
These molecules can transfer antigen-specific cell-mediated immunity from a donor who has developed protection against a particular pathogen or antigen to a recipient who has not yet encountered it.