Vitamin B3 (Niacin or Nicotinic Acid) is water soluble.
Sources
Liver, lean meats, grains, legumes and yeast.
Health Benefit
Oxidation-reduction reactions in cellular respiration.
Deficiency & Excess Effects
Pellagra (The 3 D’s of pellagra: Dermatitis, Diarrhoea and Dementia)