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B Vitamins

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Also known as: Vitamin B complex
Formal name: B1 (thiamine or thiamin); B2 (riboflavin); B3 (niacin); B5 (pantothenic acid); B6 (pyridoxal phosphate); B7 (biotin)
Related tests: Vitamin B12 and Folate

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used. To access online sources, copy and paste the URL into your browser.

Sources Used in Current Review

Evert, A. (2013 February 18). Thiamin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at https://www.nlm.nih.gov/medlineplus/ency/article/002401.htm. Accessed Oct 2015.

Evert, A. (2013 February 18). Riboflavin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at https://www.nlm.nih.gov/medlineplus/ency/article/002411.htm. Accessed Oct 2015.

Kraemer, C. (2015 February 10 Updated). Vitamin B2. Medscape Drugs & Diseases [On-line information]. Available online at http://emedicine.medscape.com/article/2086344-overview. Accessed Oct 2015.

Dalawari, P. (2014 February 5 Updated). Vitamin B1 (Thiamine). Medscape Drugs & Diseases [On-line information]. Available online at http://emedicine.medscape.com/article/2088582-overview. Accessed Oct 2015.

Evert, A. (2013 February 18 Updated). Niacin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at https://www.nlm.nih.gov/medlineplus/ency/article/002409.htm. Accessed Oct 2015.

Evert, A. (2013 February 18 Updated). Pantothenic acid and biotin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at https://www.nlm.nih.gov/medlineplus/ency/article/002410.htm. Accessed Oct 2015.

Evert, A. (2013 February 18 Updated). Vitamin B6. MedlinePlus Medical Encyclopedia. [On-line information]. Available online at https://www.nlm.nih.gov/medlineplus/ency/article/002402.htm. Accessed Oct 2015.

Frank, E. et. al. (2015 July Updated). Vitamins. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/Vitamins.html?client_ID=LTD#tabs=0. Accessed Oct 2015.

Sources Used in Previous Reviews

Evert, A. (Updated 2011 February 9) Thiamine. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/002401.htm. Accessed March 2011.

(Revised 2010 May 13). Vitamin B Complex. American Cancer Society [On-line information]. Available online at http://www.cancer.org/Treatment/TreatmentsandSideEffects/ComplementaryandAlternativeMedicine/HerbsVitaminsandMinerals/vitamin-b-complex. Accessed March 2011.

Vorvick, L. (Updated 2009 March 14). Niacin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/002409.htm. Accessed March 2011.

Frank, E. et. al. (Updated 2010 December). Vitamins. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/Vitamins.html?client_ID=LTD. Accessed March 2011.

(© 1995-2011). Unit Code 81019: Thiamin (Vitamin B1), Whole Blood. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/81019. Accessed March 2011.

(© 1995-2011). Unit Code 80230: Riboflavin (Vitamin B2), Plasma or Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/80230. Accessed March 2011.

(© 1995-2011). Unit Code 91379: Niacin (Vitamin B3). Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/91379. Accessed March 2011.

(© 1995-2011). Unit Code 91902: Vitamin B7, H (Biotin). Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/91902. Accessed March 2011.

Vorvick, L. (Updated 2009 March 7). Pantothenic acid and biotin. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/002410.htm. Accessed March 2011.

Allee, M. and Baker, M. (Updated 2009 May 18). Riboflavin Deficiency. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/125193-overview. Accessed March 2011.

Nguyen-Khoa, D. et. al. (Updated 2009 September 9). Beriberi (Thiamine Deficiency) eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/116930-overview. Accessed March 2011.

Frye, R. and Jabbour, S. (Updated 2010 May 26). Pyridoxine Deficiency. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/124947-overview. Accessed March 2011.

Hegyi, V. and Schwartz, R. (Updated 2010 July 1). Dermatologic Manifestations of Pellagra. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/1095845-overview. Accessed March 2011.

Clarke, W. and Dufour, D. R., Editors (© 2006). Contemporary Practice in Clinical Chemistry: AACC Press, Washington, DC. Pp 403-406.

Wu, A. (© 2006). Tietz Clinical Guide to Laboratory Tests, 4th Edition: Saunders Elsevier, St. Louis, MO. Pp 766-767, 808-809, 960-963, 1022-1023.

Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. McPherson R, Pincus M, eds. Philadelphia, PA: Saunders Elsevier: 2007, Pp 382-383.

(Reviewed November 2007) Linus Pauling Institute. Micronutrient Information Center: B6. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/vitaminB6/. Accessed April 2011. 

(Updated August 2008) Linus Pauling Institute. Micronutrient Information Center: Biotin. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/biotin/. Accessed April 2011.

(Reviewed June 2007) Linus Pauling Institute. Micronutrient Information Center: Niacin. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/niacin/. Accessed April 2011.

(April 2008) Linus Pauling Institute. Micronutrient Information Center, Pantothenic Acid. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/pa/. Accessed April 2011.

(June 2007) Linus Pauling Institute. Micronutrient Information Center, Riboflavin. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/riboflavin/. Accessed April 2011.

(June 2007) Linus Pauling Institute. Micronutrient Information Center, Thiamin. Available online at http://lpi.oregonstate.edu/infocenter/vitamins/thiamin/. Accessed April 2011.