The easiest way to take natural lactorferrin is to supplement high grade colostrum powder. Colostrum contains a huge amount of beneficial nutrients and is the First Milk of Life. It will help to also repair the intestines, cure allergies and also gives immunity to many common diseases because colostrum contains 50% antibodies from the mother cow
Colostrum does alot more besides-- you can check this out here, here and here.
I would also use the Sovereign Labs brand of colostrum powder since it seems to be the best.