My husband did routine blood test and b9 is too low0.59,why its so low?he never drink or smoke and nit taking any regular
medicine,cbc ,Iron,
B12,minerals,
lft and kft everything normal only vit b9 and vit d is low.Is this anything dangerous because i see b9 deficiency is not common and it indicate celiac disease and all,i am so scared please please reply