High folic acid intake in aged mice causes a lowered immune response

A study in aged mice shows that excess folic acid intake causes lowered immune function because important immune cells, called natural killer cells, are less effective. These results build upon the findings of a previous study in 2005 by the same lab that found that 78 percent of healthy postmenopausal women had unmetabolized folic acid in their blood plasma, which is indicative of excess folic acid intake. (Mehr in: Cancer News — ScienceDaily)