The daily requirement for zinc during pregnancy is 15 milligrams. Your supplement is therefore, giving you all that you need for pregnancy requirements. Too much zinc can actually backfire on you. When you suck on zinc lozenges and decrease your incidence of colds,you are experiencing the action of a little extra zinc enhancing the immune system. Regular ingestion of more than 50 mg of zinc can also cause interference with the absorption of other nutrients, causing secondary deficiencies.
Copper is one such mineral whose absorption is depressed with too much zinc.
Although zinc has a low toxicity for humans, The National Academy of Science actually warns against zinc supplements of more than 15 mg daily without medical supervision. Your pre-natal supplement falls under that category, and so is okay. The problem with too much zinc comes from a continued ingestion of excessive doses. The extra zinc that you take should not be a problem, however, because you are not taking it on a daily, or even weekly basis. In light of the current advise for women to take plenty of folate during pre-pregnancy and early pregnancy, it is important to know that high supplements of folate can block intestinal absorption of zinc, creating a potentially dangerous deficiency.