They are not subject to the same scrutiny and regulations as prescription medicines. Use of black cohosh to lower cholesterol is being studied. Follow the directions printed on the product label or given by your doctor. An overdose of black cohosh can cause nausea, dizziness, nervous system and vision problems, reduced heart rate, and increased sweating. Don't use black cohosh for more than 6 months.
Black cohosh contains salicylic acid.
Use it with caution if you are also taking salicylate medicines such as aspirin. Black cohosh should not be used during pregnancy. In large doses it may cause premature birth. Some natural remedies have the same effects as prescription medicines. This means there is a danger of being overmedicated.