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further study, particularly clinical trials. © 2020 Wiley Periodicals, Inc.Folic acid (FA) is routinely supplemented in the food of pregnant women or women planning a pregnancy, but whether FA exerts a positive effect on preventing fetal bone malformation remains obscure. In this study, we first exposed chick embryos with different concentrations of FA (1-10,000 pmol/egg) and studied vertebral mineralization and ossification through alcian blue and alizarin red as well as hematoxylin and eosin staining. Morphological measurements of the thoracic vertebral b