Probably the most widely publicised is the addition of folic acid to the diet 1 month preconception, and up to 16 weeks, to reduce the risk of Neural Tube Defects of all types.
Confirmatory studies are underway.
Herbal Golden Seal increases uterine irritability and miscarriage Alkaloids such as in coltsfoot, groundsel, ragwort, and butterbur, have caused foetal ascites, hepatomegaly and stillbirth. Medications Many drugs cause adverse reactions in the foetus, but the following are of particular concern as they are common and teratagenic. The aim is to withdraw or reduce the treatment as far as possible prior to the month of conception. In, general, all medications should be avoided in pregnancy, and if unavoidable, restrained to category A types. Diazepam Diazepam has been asscociated with cleft palate.