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* Yarrow is an essential oil that should be avoided during pregnancy because it can alter the way certain functions are carried out in your body, which may cause harm to the unborn baby.* In rare cases, yarrow can cause severe allergic skin rashes; prolonged use can increase the skin's photosensitivity. This can be triggered initially when wet skin comes into contact with cut grass and yarrow together.* According to the ASPCA, yarrow is toxic to dogs, cats, and horses, causing vomiting, diarrhea, depression, anorexia, and hypersalivation.* In a standard rodent model for reproductive toxicity, aqueous extracts of yarrow produced a significant increase in the percentage of abnormal sperm.