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When taken by mouth: Stinging nettle is POSSIBLY SAFE when taken by mouth for up to 2 years. It might cause diarrhea, constipation, and upset stomach in some people.
When applied to the skin: Stinging nettle is POSSIBLY SAFE when applied to the skin in appropriate amounts. 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's also best to avoid stinging nettle if you are breast-feeding.
Diabetes: There is some evidence that stinging nettle above ground parts can decrease blood sugar levels. This might increase the chance of blood sugar levels becoming too low in people being treated for diabetes. Monitor your blood sugar carefully.
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 above ground parts of stinging nettle seem to increase urine flow. If you have kidney problems, discuss stinging nettle with your healthcare provider before starting it.
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