Because there is no guarantee of strength, purity or safety of DHEA products (they are not usually regulated by the Food and Drug Administration), it’s important to read labels, do your research when buying supplements and follow directions. ( 11 ) The University of Maryland Medical Center advises that you try to purchase DHEA directly from a doctor in order to ensure it’s authentic and not contaminated. DHEA comes in capsule, tablet, chewing gum, sublingual (under the tongue) drop and topical (on the skin) cream form, but the type you’ll want to use depends on what you’re using it for. ( 12 )
Pregnancy -- Low levels of vitamin D in pregnancy are associated with gestational diabetes , pre-eclampsia , and small infants.  Although taking vitamin D supplements during pregnancy raises blood levels of vitamin D in the mother at term,  the extent of benefits for the mother or fetus is unclear.    Pregnant women who take an adequate amount of vitamin D during gestation may experience a lower risk of pre-eclampsia  and positive immune effects.  Pregnant women often do not take the recommended amount of vitamin D.