When taken orally for up to 12 weeks in appropriate doses, St. John's wort is generally considered safe. However, it may cause:
- Agitation and anxiety
- Dizziness
- Diarrhea, constipation and stomach discomfort
- Dry mouth
Other side effects may include:
- Fatigue and insomnia
- Headache
- Increased sensitivity to sunlight (photosensitivity)
There isn't enough information about the safety of using St. John's wort topically.
Don't use St. John's wort during pregnancy or while breastfeeding.