Safety and side effects

When taken by mouth for up to 12 weeks in appropriate doses, St. John's wort is generally considered safe. But it may cause:

• Anxiety.
• Dizziness.
• Diarrhea, constipation, and upset stomach.
• Dry mouth.

Other side effects may include:

• Tiredness and trouble sleeping.
• Headache.
• Higher sensitivity to sunlight, also called photosensitivity.

There isn't enough information about the safety of using St. John's wort on the skin.

Don't use St. John's wort during pregnancy or while breastfeeding.