Flaxseed is possibly unsafe during pregnancy; therefore, ask a physician before taking this supplement. Mayo Clinic and the University of Maryland Medical Center agree that flaxseed contains alpha-linolenic acid, which has similar properties to estrogen. Too much estrogen could induce labor, according to the University of Florida.
As of August 2014, research is inconclusive regarding estrogen and its role in labor. Reports warn against the use of flaxseed during pregnancy due to lack of research into its effects on pregnancy and the logical reasoning that it will impact the pregnancy in much the same way as too much estrogen. Estrogen is necessary to maintain pregnancy; however, if researchers are correct and too much estrogen begins labor, then flaxseed may cause the same effect.