Stinging nettle is possibly safe when taken by mouth for up to 2 years or when applied to the skin appropriately. However, it might cause stomach complaints and sweating. Touching the stinging nettle plant can cause skin irritation.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Stinging nettle is likely unsafe to take during pregnancy. It might stimulate uterine contractions and cause a miscarriage. It is also best to avoid stinging nettle if you are breast-feeding.
Diabetes: There is some evidence stinging nettle above ground parts can decrease blood sugar levels. It might increase the chance of low blood sugar in people being treated for diabetes. Monitor your blood sugar carefully if you have diabetes and use stinging nettle.
Low blood pressure: Stinging nettle above ground parts might lower blood pressure. In theory, stinging nettle might increase the risk of blood pressure dropping too low in people prone to low blood pressure. If you have low blood pressure, discuss stinging nettle with your healthcare provider before starting it.
Kidney problems: The aboveground parts of stinging nettle seem to increase urine flow. If you have kidney problems, discuss stinging nettle with your healthcare provider before starting it.