Avoid these products if you suffer from thyroid disease:
- The herb ephedra, once found in herbal formulas, and its extracts ephedrine and pseudoephedrine, found in over-the-counter cold remedies. They can cause nervousness, insomnia, headache, and high blood pressure.
- Alkaloids, including substances such as caffeine, morphine, and quinine, which can increase blood pressure and heart rate.