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4Life Transfer Factor Tri-Factor Formula helps balance and support the immune system, according to what the body needs. 4Life Transfer Factor proteins and other peptides support the immune systemâs ability to respond quickly and effectively. And, because 4Life Transfer Factor is certified, you can place your trust in the sound science and quality of this product. 4Life Transfer Factor Tri-Factor Formula contains ingredients made by the immune system for the immune system. The messenger molecules found in this product help educate immune cells and support the immune systemâs ability to more effectively recognize, respond to, and remember potential health threats.