Lemon balm is likely safe when used in food amounts. It is possibly safe in adults when used in medicinal amounts for a short-term. It has been used safely in research for up to four months. Not enough is known about the safety of lemon balm when used long-term.
Some information suggests that lemon balm might be safe when taken in appropriate amounts by infants for up to a week and by older children under age 12 for up to one month.
When taken by mouth, lemon balm can cause some side effects including nausea, vomiting, abdominal pain, dizziness and wheezing.
When applied to the skin, there is one report of irritation and one report of increased cold sore symptoms.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Not enough is known about the use of lemon balm during pregnancy and breast-feeding. Stay on the safe side and avoid use.
Children: Lemon balm is possibly safe when taken appropriately by mouth for short periods of time.
Surgery: Lemon balm might cause too much drowsiness if combined with medications used during and after surgery. Stop using lemon balm at least 2 weeks prior to a scheduled surgery.