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(I'm not an expert nor a doctor. I may not have even identified the correct plant. Information purposes only!) From the wiki - Like many other plants, including many food plants and those used as culinary herbs, black haw contains salicin, a chemical relative of aspirin. Those who are allergic to that substance should not use black haw. In addition, due to the connection between aspirin and Reye's syndrome, young people or people afflicted with a viral disease should not use black haw. (I'm not an expert nor a doctor. I may not have even identified the correct plant. Information purposes only!) From the wiki - The chemicals in black haw do relax the uterus and therefore probably prevent miscarriage; however, the salicin may be teratogenic. Consequently, pregnant women should not use black haw in the first two trimesters. Furthermore, anyone using herbs for medical reasons should only use them under the supervision of a qualified medical professional.