(2016 December 20, Updated). Vitamins and Minerals. NIH National Center for Complementary and Integrative Health. Available online at https://nccih.nih.gov/health/vitamins. Accessed on 12/20/17.

(2016 February 17, Updated). Zinc. National Institutes of Health Office of Dietary Supplements. Available online at https://ods.od.nih.gov/factsheets/Zinc-Consumer/. Accessed on 12/20/17.

(2016 February 17, Updated). Selenium. National Institutes of Health Office of Dietary Supplements. Available online at https://ods.od.nih.gov/factsheets/Selenium-Consumer/. Accessed on 12/20/17.

Johnson, L. (© 2017). Overview of Minerals. Merck Manual Consumer Version. Available online at http://www.merckmanuals.com/home/disorders-of-nutrition/minerals/overview-of-minerals. Accessed on 12/20/17.

(2015 March 31, Updated). Micronutrient Facts. CDC International Micronutrient Malnutrition Prevention and Control (IMMPaCt). Available online at https://www.cdc.gov/immpact/micronutrients/index.php. Accessed on 12/20/17.

Grenache, D. (2017 August, Updated). Trace Minerals. ARUP Consult. Available online at https://arupconsult.com/content/trace-minerals. Accessed on 12/20/17.

(2013 November 4, Updated). Chromium. National Institutes of Health Office of Dietary Supplements. Available online at https://ods.od.nih.gov/factsheets/Chromium-HealthProfessional/. Accessed on 12/20/17.

Clarke, W. and Dufour, D. R., Editors (© 2006). Contemporary Practice in Clinical Chemistry: AACC Press, Washington, DC. Pp 407-410.

Wu, A. (© 2006). Tietz Clinical Guide to Laboratory Tests, 4th Edition: Saunders Elsevier, St. Louis, MO. Pp 260-261, 292-295, 408-409, 634-637, 710-713, 746-747, 976-977, 1152-1155.

(Updated 2005 August 5). Chromium. National Institutes of Health, Office of Dietary Supplements, Dietary Supplement Fact Sheet [On-line information]. Available online at http://ods.od.nih.gov/factsheets/chromium.asp. Accessed April 2009.

(Updated 2007 August 24). Iron. National Institutes of Health, Office of Dietary Supplements, Dietary Supplement Fact Sheet [On-line information]. Available online at http://dietary-supplements.info.nih.gov/factsheets/iron.asp. Accessed April 2009.

(Updated 2004 August 1). Selenium. National Institutes of Health, Office of Dietary Supplements, Dietary Supplement Fact Sheet [On-line information]. Available online at http://dietary-supplements.info.nih.gov/factsheets/selenium.asp. Accessed April 2009.

(Updated 2009 January 21). Zinc. National Institutes of Health, Office of Dietary Supplements, Dietary Supplement Fact Sheet [On-line information]. Available online at http://dietary-supplements.info.nih.gov/FactSheets/Zinc.asp. Accessed April 2009.

Johnson, L. (Reviewed 2008 August). Mineral Deficiency and Toxicity The Merck Manual for Healthcare Professionals [On-line information]. Available online at http://www.merck.com/mmpe/sec01/ch005/ch005a.html?qt=trace%20mineral&alt=sh. Accessed March 2009.

Johnson, L. (Reviewed 2008 August). Minerals and Electrolytes. The Merck Manual of Medical Information – Second Home Edition [On-line information]. Available online at http://www.merck.com/mmhe/sec12/ch155/ch155a.html. Accessed March 2009.

McMillin, G. (Updated 2008 September). Trace Minerals. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/GastrointestinalDz/NutritionalAssessment/TraceMinerals.html. Accessed April 2009.

L. Aills, et al. (2008 March 12). ASMBS Allied Health Nutritional Guidelines for the Surgical Weight Loss Patient. Surgery for Obesity and Related Diseases 4 (2008) S73-S108 [On-line information]. PDF available for download at http://www.asbs.org/Newsite07/resources/bgs_final.pdf. Accessed April 2009.

World Health Organization. Micronutrient deficiencies. Available online at http://www.who.int/nutrition/topics/ida/en/. Accessed on Mar. 24, 2013.

Baratz, R. S. (2011 February 11, Reviewed). Hair Analysis Panel Discussion. Agency for Toxic Substances & Disease Registry. Available online at http://www.atsdr.cdc.gov/HAC/hair_analysis/Appendix_c_robert.html. Accessed on Mar. 24, 2013.

Table 5-1 Trace Minerals. Merck Manual. PDF available for download at http://www.merckmanuals.com/media/professional/pdf/Trace_minerals.pdf. Accessed on Mar. 25, 2013.

National Institutes of Health. Dietary Supplement Fact Sheet: Iron. Available online at http://ods.od.nih.gov/factsheets/Iron-HealthProfessional/. Accessed on Mar. 25. 2013.

Mayo Clinic. A Vitamin A Day Might Not Keep The Doctor Away. Mar. 14, 2012. Available online at http://www.mayoclinic.org/news2012-mchi/6760.html. Accessed Mar. 26, 2013.