Skullcap can have potentially serious side effects if used incorrectly. Make sure you start out on a low dose and monitor how your body reacts. Some of the most common side effects are drowsiness, mental dulling, irregular pulse, and allergic reactions such as rash or throat swelling. Prolonged over use can effect the liver and cause jaundice, which can be seen in yellowing skin and eyes. Skullcap can also effect prescription medicines so make sure to check with your doctor if you are taking any prescribed drugs.
If you take this supplement make sure you follow the recommended dosage and stop using it if you experience any of the symptoms above.