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(1) http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-B.aspx#niacin
(2) https://www.bda.uk.com/foodfacts/SkinHealth.pdf
(3) https://www.bda.uk.com/foodfacts/foodmood.pdf
(4) http://www.nhs.uk/Conditions/vitamins-minerals/Pages/vitamins-minerals.aspx
(5) http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-B.aspx#niacin
(6) http://patient.info/doctor/pellagra
(7) http://www.webmd.com/diet/niacin-deficiency-symptoms-and-treatments