Marshmallow is likely safe for most people when taken by mouth. In some people, it might cause low blood sugar levels. Marshmallow is possibly safe when applied directly to the skin.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Not enough is known about the use of marshmallow during pregnancy and breast-feeding. Stay on the safe side and avoid use.
Diabetes: There is a concern that marshmallow might interfere with blood sugar control. If you have diabetes, check your blood sugar carefully to avoid dangerously low blood sugar.
Surgery: Marshmallow might affect blood sugar levels. There is a concern that it could interfere with blood sugar control during and after surgical procedures. Stop taking marshmallow at least 2 weeks prior to a scheduled surgery.