Side Effects
Human-derived transfer factor appears to be safe for use for up to two years and bovine-derived cellular transfer factor for up to three months. Side effects include fever and swelling and pain at the injection site. Concern has been raised over the possibility of catching Bovine spongiform encephalopathy (Mad Cow Disease) or other diseases from animal-derived products. Transfer factors are contraindicated for women who are pregnant or breastfeeding. Because human- and bovine-derived transfer factor are generated from blood cells they carry the potential for blood-borne disease such as HIV/AIDS and Hepatitis C.
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