When taken in recommended dosages, vanadium has not been associated with any significant or bothersome side effects. At high dosages, vanadium has been known to cause stomach cramping and diarrhea as well as a green tongue.
No drugs are known to interact adversely with vanadium. Smokers may absorb less of the mineral.
Atkins, Robert C. Dr. Atkins' Vita-Nutrient Solution. New York: Simon & Schuster, 1998.
Miller, Lucinda G., and Wallace J. Murray. Herbal Medicinals: A Clinician's Guide. New York: Pharmaceutical Products Press, 1998.
Sifton, David W. PDR Family Guide to Natural Medicines and Healing Therapies. New York: Three Rivers Press, 1999.
Herb Research Foundation. 1007 Pearl Street, Suite 200. Boulder, CO 80302.
National Diabetes Information Clearinghouse. 1 Information Way. Bethesda, MD 20892-3560.