In this Article
Transfer factors that are taken from cows are POSSIBLY SAFE when used short-term, up to 3 months. They can cause fever in some people. Transfer factors given as a shot (by injection) can cause swelling and pain where the injection is given.
There is some concern about the possibility of catching "mad cow disease" (bovine spongiform encephalitis, BSE) or other diseases from products that come from animals. "Mad cow disease" has not been transmitted by transfer factor, but it is probably wise to avoid animal products from countries where mad cow disease has been found.
Special Precautions & Warnings:Children: The shot form of transfer factor from humans is POSSIBLY SAFE in children when given for up to 6 years. Transfer factor from cows is POSSIBLY SAFE in children when given by mouth for up to 6 months.
Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking transfer factor if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.