Since<unk>  is present in many foods at low concentrations, deficiency is rare except in locations where malnourishment is very common. Pregnancy, however, alters<unk>  catabolism and despite a regular<unk>  intake, half of the pregnant women in the U.S. are marginally<unk>  deficient.
Biotin deficiency
Chromium deficiency
Copper deficiency
Fluorine deficiency
Boron deficiency 
Selenium deficiency
Manganese deficiency 
Thiamine deficiency