Special Precautions & Warnings:
Pregnancy and breast-feeding: It is unsafe to use hyssop during pregnancy because it might cause the uterus to contract or start menstruation. These effects could lead to a miscarriage.
It is not known whether hyssop is safe to use during breast-feeding. Stay on the safe side and avoid use.
Children: It is unsafe to give hyssop to children. Convulsions were reported in a child who took 2-3 drops of hyssop oil over several days.
Seizures: If you have a history of having seizures, donot use hyssop. It might trigger seizures or make them worse.