Folic acid is also known as vitamin B9 or folate. Most recognisably it supports the healthy growth of maternal tissue during pregnancy, which is believed to help prevent the occurrence of birth defects. This 400iu strength vitamin D supplement is safe to be taken during pregnancy and by children over the age of 5 years old. Plus, as we age, the skin loses its ability to produce vitamin D as effectively as it once did, which can leave bones weak and fragile. For these reasons, experts recommend increased levels of vitamin D during childhood, pregnancy and for adults over the age of 55.