Skin Nutrition: Vitamins and Minerals for Your Skin. 2014. Skin Nutrition: Vitamins and Minerals for Your Skin. [ONLINE] Available at: http://www.webmd.com/beauty/face/skin-nutrition?page=1. [Accessed 16 December 2014
Hair, Skin & Nails Vitamin Supplement . 2014. Hair, Skin & Nails Vitamin Supplement . [ONLINE] Available at: http://www.cytoplan.co.uk/hair-skin-nails-supplement-msm-amino-acid-3643/. [Accessed 16 December 2014].
What Are the Differences Between Macronutrients and Micronutrients?. 2014. What Are the Differences Between Macronutrients and Micronutrients?. [ONLINE] Available at: http://www.wisegeek.org/what-are-the-differences-between-macronutrients-and-micronutrients.htm. [Accessed 16 December 2014].
What Are the Best Natural Sources of Vitamin D? (with pictures). 2014. What Are the Best Natural Sources of Vitamin D? (with pictures). [ONLINE] Available at: http://www.wisegeek.com/what-are-the-best-natural-sources-of-vitamin-d.htm. [Accessed 16 December 2014].
Function of Vitamin D. 2014. Function of Vitamin D. [ONLINE] Available at: http://www.buzzle.com/articles/function-of-vitamin-d.html. [Accessed 16 December 2014].
Vitamin K: MedlinePlus Medical Encyclopedia. 2014. Vitamin K: MedlinePlus Medical Encyclopedia. [ONLINE] Available at: http://www.nlm.nih.gov/medlineplus/ency/article/002407.htm. [Accessed 16 December 2014].
Vitamin K: MedlinePlus Medical Encyclopedia. 2014. Vitamin K: MedlinePlus Medical Encyclopedia. [ONLINE] Available at: http://www.nlm.nih.gov/medlineplus/ency/article/002407.htm. [Accessed 16 December 2014].Riboflavin Nutrition - Nutrition, Function, Side Effects - NY Times Health Information . 2014. Riboflavin Nutrition - Nutrition, Function, Side Effects - NY Times Health Information . [ONLINE] Available at: http://www.nytimes.com/health/guides/nutrition/riboflavin/overview.html. [Accessed 16 December 2014].
Niacin Deficiency: Symptoms, Causes, and Treatment. 2014. Niacin Deficiency: Symptoms, Causes, and Treatment. [ONLINE] Available at: http://www.webmd.com/diet/niacin-deficiency-symptoms-and-treatments. [Accessed 16 December 2014 vitamin B3 - niacin. 2014. vitamin B3 - niacin. [ONLINE] Available at: http://www.whfoods.com/genpage.php?tname=nutrient&dbid=83. [Accessed 16 December 2014].
Symptoms of Biotin deficiency - RightDiagnosis.com. 2014. Symptoms of Biotin deficiency - RightDiagnosis.com. [ONLINE] Available at: http://www.rightdiagnosis.com/b/biotin_deficiency/symptoms.htm. [Accessed 16 December 2014
Phosphorus Deficiency in Humans. 2014. Phosphorus Deficiency in Humans. [ONLINE] Available at: http://www.buzzle.com/articles/phosphorus-deficiency.html. [Accessed 16 December 2014].
Zinc in diet: MedlinePlus Medical Encyclopedia. 2014. Zinc in diet: MedlinePlus Medical Encyclopedia. [ONLINE] Available at: